sqlhelper.cs

tag:asp.net 

using System;
using System.Data;
using System.Xml;
using System.Data.SqlClient;
using System.Collections;
using System.Configuration;

namespace SooFan.SqlDataProvider
{
 public sealed class SqlHelper
 {
       
  public static readonly string CONN_STRING = ConfigurationSettings.AppSettings["CONN_STRING"];
  public static readonly string CONN_STRING1 = ConfigurationSettings.AppSettings["CONN_STRING1"];
        private static Hashtable parmCache = Hashtable.Synchronized( new Hashtable() );
  #region private utility methods & constructors

  // Since this class provides only static methods, make the default constructor private to prevent
  // instances from being created with "new SqlHelper()"
  private SqlHelper() {}

  /// <summary>
  /// This method is used to attach array of SqlParameters to a SqlCommand.
  ///
  /// This method will assign a value of DbNull to any parameter with a direction of
  /// InputOutput and a value of null. 
  ///
  /// This behavior will prevent default values from being used, but
  /// this will be the less common case than an intended pure output parameter (derived as InputOutput)
  /// where the user provided no input value.
  /// </summary>
  /// <param name="command">The command to which the parameters will be added</param>
  /// <param name="commandParameters">An array of SqlParameters to be added to command</param>
  private static void AttachParameters(SqlCommand command, SqlParameter[] commandParameters)
  {
   if( command == null ) throw new ArgumentNullException( "command" );
   if( commandParameters != null )
   {
    foreach (SqlParameter p in commandParameters)
    {
     if( p != null )
     {
      // Check for derived output value with no value assigned
      if ( ( p.Direction == ParameterDirection.InputOutput ||
       p.Direction == ParameterDirection.Input ) &&
       (p.Value == null))
      {
       p.Value = DBNull.Value;
      }
      command.Parameters.Add(p);
     }
    }
   }
  }

  /// <summary>
  /// This method assigns dataRow column values to an array of SqlParameters
  /// </summary>
  /// <param name="commandParameters">Array of SqlParameters to be assigned values</param>
  /// <param name="dataRow">The dataRow used to hold the stored procedure's parameter values</param>
  private static void AssignParameterValues(SqlParameter[] commandParameters, DataRow dataRow)
  {
   if ((commandParameters == null) || (dataRow == null))
   {
    // Do nothing if we get no data
    return;
   }

   int i = 0;
   // Set the parameters values
   foreach(SqlParameter commandParameter in commandParameters)
   {
    // Check the parameter name
    if( commandParameter.ParameterName == null ||
     commandParameter.ParameterName.Length <= 1 )
     throw new Exception(
      string.Format(
      "Please provide a valid parameter name on the parameter #{0}, the ParameterName property has the following value: '{1}'.",
      i, commandParameter.ParameterName ) );
    if (dataRow.Table.Columns.IndexOf(commandParameter.ParameterName.Substring(1)) != -1)
     commandParameter.Value = dataRow[commandParameter.ParameterName.Substring(1)];
    i++;
   }
  }

  /// <summary>
  /// This method assigns an array of values to an array of SqlParameters
  /// </summary>
  /// <param name="commandParameters">Array of SqlParameters to be assigned values</param>
  /// <param name="parameterValues">Array of objects holding the values to be assigned</param>
  private static void AssignParameterValues(SqlParameter[] commandParameters, object[] parameterValues)
  {
   if ((commandParameters == null) || (parameterValues == null))
   {
    // Do nothing if we get no data
    return;
   }

   // We must have the same number of values as we pave parameters to put them in
   if (commandParameters.Length != parameterValues.Length)
   {
    throw new ArgumentException("Parameter count does not match Parameter Value count.");
   }

   // Iterate through the SqlParameters, assigning the values from the corresponding position in the
   // value array
   for (int i = 0, j = commandParameters.Length; i < j; i++)
   {
    // If the current array value derives from IDbDataParameter, then assign its Value property
    if (parameterValues[i] is IDbDataParameter)
    {
     IDbDataParameter paramInstance = (IDbDataParameter)parameterValues[i];
     if( paramInstance.Value == null )
     {
      commandParameters[i].Value = DBNull.Value;
     }
     else
     {
      commandParameters[i].Value = paramInstance.Value;
     }
    }
    else if (parameterValues[i] == null)
    {
     commandParameters[i].Value = DBNull.Value;
    }
    else
    {
     commandParameters[i].Value = parameterValues[i];
    }
   }
  }

  /// <summary>
  /// This method opens (if necessary) and assigns a connection, transaction, command type and parameters
  /// to the provided command
  /// </summary>
  /// <param name="command">The SqlCommand to be prepared</param>
  /// <param name="connection">A valid SqlConnection, on which to execute this command</param>
  /// <param name="transaction">A valid SqlTransaction, or 'null'</param>
  /// <param name="commandType">The CommandType (stored procedure, text, etc.)</param>
  /// <param name="commandText">The stored procedure name or T-SQL command</param>
  /// <param name="commandParameters">An array of SqlParameters to be associated with the command or 'null' if no parameters are required</param>
  /// <param name="mustCloseConnection"><c>true</c> if the connection was opened by the method, otherwose is false.</param>
  private static void PrepareCommand(SqlCommand command, SqlConnection connection, SqlTransaction transaction, CommandType commandType, string commandText, SqlParameter[] commandParameters, out bool mustCloseConnection )
  {
   if( command == null ) throw new ArgumentNullException( "command" );
   if( commandText == null || commandText.Length == 0 ) throw new ArgumentNullException( "commandText" );

   // If the provided connection is not open, we will open it
   if (connection.State != ConnectionState.Open)
   {
    mustCloseConnection = true;
    connection.Open();
   }
   else
   {
    mustCloseConnection = false;
   }

   // Associate the connection with the command
   command.Connection = connection;

   // Set the command text (stored procedure name or SQL statement)
   command.CommandText = commandText;

   // If we were provided a transaction, assign it
   if (transaction != null)
   {
    if( transaction.Connection == null ) throw new ArgumentException( "The transaction was rollbacked or commited, please provide an open transaction.", "transaction" );
    command.Transaction = transaction;
   }

   // Set the command type
   command.CommandType = commandType;

   // Attach the command parameters if they are provided
   if (commandParameters != null)
   {
    AttachParameters(command, commandParameters);
   }
   return;
  }

  #endregion private utility methods & constructors

  #region ExecuteNonQuery

  /// <summary>
  /// Execute a SqlCommand (that returns no resultset and takes no parameters) against the database specified in
  /// the connection string
  /// </summary>
  /// <remarks>
  /// e.g.: 
  ///  int result = ExecuteNonQuery(connString, CommandType.StoredProcedure, "PublishOrders");
  /// </remarks>
  /// <param name="connectionString">A valid connection string for a SqlConnection</param>
  /// <param name="commandType">The CommandType (stored procedure, text, etc.)</param>
  /// <param name="commandText">The stored procedure name or T-SQL command</param>
  /// <returns>An int representing the number of rows affected by the command</returns>
  public static int ExecuteNonQuery(string connectionString, CommandType commandType, string commandText)
  {
   // Pass through the call providing null for the set of SqlParameters
   return ExecuteNonQuery(connectionString, commandType, commandText, (SqlParameter[])null);
  }

  /// <summary>
  /// Execute a SqlCommand (that returns no resultset) against the database specified in the connection string
  /// using the provided parameters
  /// </summary>
  /// <remarks>
  /// e.g.: 
  ///  int result = ExecuteNonQuery(connString, CommandType.StoredProcedure, "PublishOrders", new SqlParameter("@prodid", 24));
  /// </remarks>
  /// <param name="connectionString">A valid connection string for a SqlConnection</param>
  /// <param name="commandType">The CommandType (stored procedure, text, etc.)</param>
  /// <param name="commandText">The stored procedure name or T-SQL command</param>
  /// <param name="commandParameters">An array of SqlParamters used to execute the command</param>
  /// <returns>An int representing the number of rows affected by the command</returns>
  public static int ExecuteNonQuery(string connectionString, CommandType commandType, string commandText, params SqlParameter[] commandParameters)
  {
   if( connectionString == null || connectionString.Length == 0 ) throw new ArgumentNullException( "connectionString" );

   // Create & open a SqlConnection, and dispose of it after we are done
   using (SqlConnection connection = new SqlConnection(connectionString))
   {
    connection.Open();

    // Call the overload that takes a connection in place of the connection string
    return ExecuteNonQuery(connection, commandType, commandText, commandParameters);
   }
  }

  /// <summary>
  /// Execute a stored procedure via a SqlCommand (that returns no resultset) against the database specified in
  /// the connection string using the provided parameter values.  This method will query the database to discover the parameters for the
  /// stored procedure (the first time each stored procedure is called), and assign the values based on parameter order.
  /// </summary>
  /// <remarks>
  /// This method provides no access to output parameters or the stored procedure's return value parameter.
  ///
  /// e.g.: 
  ///  int result = ExecuteNonQuery(connString, "PublishOrders", 24, 36);
  /// </remarks>
  /// <param name="connectionString">A valid connection string for a SqlConnection</param>
  /// <param name="spName">The name of the stored prcedure</param>
  /// <param name="parameterValues">An array of objects to be assigned as the input values of the stored procedure</param>
  /// <returns>An int representing the number of rows affected by the command</returns>
  public static int ExecuteNonQuery(string connectionString, string spName, params object[] parameterValues)
  {
   if( connectionString == null || connectionString.Length == 0 ) throw new ArgumentNullException( "connectionString" );
   if( spName == null || spName.Length == 0 ) throw new ArgumentNullException( "spName" );

   // If we receive parameter values, we need to figure out where they go
   if ((parameterValues != null) && (parameterValues.Length > 0))
   {
    // Pull the parameters for this stored procedure from the parameter cache (or discover them & populate the cache)
    SqlParameter[] commandParameters = SqlHelperParameterCache.GetSpParameterSet(connectionString, spName);

    // Assign the provided values to these parameters based on parameter order
    AssignParameterValues(commandParameters, parameterValues);

    // Call the overload that takes an array of SqlParameters
    return ExecuteNonQuery(connectionString, CommandType.StoredProcedure, spName, commandParameters);
   }
   else
   {
    // Otherwise we can just call the SP without params
    return ExecuteNonQuery(connectionString, CommandType.StoredProcedure, spName);
   }
  }

  /// <summary>
  /// Execute a SqlCommand (that returns no resultset and takes no parameters) against the provided SqlConnection.
  /// </summary>
  /// <remarks>
  /// e.g.: 
  ///  int result = ExecuteNonQuery(conn, CommandType.StoredProcedure, "PublishOrders");
  /// </remarks>
  /// <param name="connection">A valid SqlConnection</param>
  /// <param name="commandType">The CommandType (stored procedure, text, etc.)</param>
  /// <param name="commandText">The stored procedure name or T-SQL command</param>
  /// <returns>An int representing the number of rows affected by the command</returns>
  public static int ExecuteNonQuery(SqlConnection connection, CommandType commandType, string commandText)
  {
   // Pass through the call providing null for the set of SqlParameters
   return ExecuteNonQuery(connection, commandType, commandText, (SqlParameter[])null);
  }

  /// <summary>
  /// Execute a SqlCommand (that returns no resultset) against the specified SqlConnection
  /// using the provided parameters.
  /// </summary>
  /// <remarks>
  /// e.g.: 
  ///  int result = ExecuteNonQuery(conn, CommandType.StoredProcedure, "PublishOrders", new SqlParameter("@prodid", 24));
  /// </remarks>
  /// <param name="connection">A valid SqlConnection</param>
  /// <param name="commandType">The CommandType (stored procedure, text, etc.)</param>
  /// <param name="commandText">The stored procedure name or T-SQL command</param>
  /// <param name="commandParameters">An array of SqlParamters used to execute the command</param>
  /// <returns>An int representing the number of rows affected by the command</returns>
  public static int ExecuteNonQuery(SqlConnection connection, CommandType commandType, string commandText, params SqlParameter[] commandParameters)
  { 
   if( connection == null ) throw new ArgumentNullException( "connection" );

   // Create a command and prepare it for execution
   SqlCommand cmd = new SqlCommand();
   bool mustCloseConnection = false;
   PrepareCommand(cmd, connection, (SqlTransaction)null, commandType, commandText, commandParameters, out mustCloseConnection );
      
   // Finally, execute the command
   int retval = cmd.ExecuteNonQuery();
      
   // Detach the SqlParameters from the command object, so they can be used again
   cmd.Parameters.Clear();
   if( mustCloseConnection )
    connection.Close();
   return retval;
  }

  /// <summary>
  /// Execute a stored procedure via a SqlCommand (that returns no resultset) against the specified SqlConnection
  /// using the provided parameter values.  This method will query the database to discover the parameters for the
  /// stored procedure (the first time each stored procedure is called), and assign the values based on parameter order.
  /// </summary>
  /// <remarks>
  /// This method provides no access to output parameters or the stored procedure's return value parameter.
  ///
  /// e.g.: 
  ///  int result = ExecuteNonQuery(conn, "PublishOrders", 24, 36);
  /// </remarks>
  /// <param name="connection">A valid SqlConnection</param>
  /// <param name="spName">The name of the stored procedure</param>
  /// <param name="parameterValues">An array of objects to be assigned as the input values of the stored procedure</param>
  /// <returns>An int representing the number of rows affected by the command</returns>
  public static int ExecuteNonQuery(SqlConnection connection, string spName, params object[] parameterValues)
  {
   if( connection == null ) throw new ArgumentNullException( "connection" );
   if( spName == null || spName.Length == 0 ) throw new ArgumentNullException( "spName" );

   // If we receive parameter values, we need to figure out where they go
   if ((parameterValues != null) && (parameterValues.Length > 0))
   {
    // Pull the parameters for this stored procedure from the parameter cache (or discover them & populate the cache)
    SqlParameter[] commandParameters = SqlHelperParameterCache.GetSpParameterSet(connection, spName);

    // Assign the provided values to these parameters based on parameter order
    AssignParameterValues(commandParameters, parameterValues);

    // Call the overload that takes an array of SqlParameters
    return ExecuteNonQuery(connection, CommandType.StoredProcedure, spName, commandParameters);
   }
   else
   {
    // Otherwise we can just call the SP without params
    return ExecuteNonQuery(connection, CommandType.StoredProcedure, spName);
   }
  }

  /// <summary>
  /// Execute a SqlCommand (that returns no resultset and takes no parameters) against the provided SqlTransaction.
  /// </summary>
  /// <remarks>
  /// e.g.: 
  ///  int result = ExecuteNonQuery(trans, CommandType.StoredProcedure, "PublishOrders");
  /// </remarks>
  /// <param name="transaction">A valid SqlTransaction</param>
  /// <param name="commandType">The CommandType (stored procedure, text, etc.)</param>
  /// <param name="commandText">The stored procedure name or T-SQL command</param>
  /// <returns>An int representing the number of rows affected by the command</returns>
  public static int ExecuteNonQuery(SqlTransaction transaction, CommandType commandType, string commandText)
  {
   // Pass through the call providing null for the set of SqlParameters
   return ExecuteNonQuery(transaction, commandType, commandText, (SqlParameter[])null);
  }

  /// <summary>
  /// Execute a SqlCommand (that returns no resultset) against the specified SqlTransaction
  /// using the provided parameters.
  /// </summary>
  /// <remarks>
  /// e.g.: 
  ///  int result = ExecuteNonQuery(trans, CommandType.StoredProcedure, "GetOrders", new SqlParameter("@prodid", 24));
  /// </remarks>
  /// <param name="transaction">A valid SqlTransaction</param>
  /// <param name="commandType">The CommandType (stored procedure, text, etc.)</param>
  /// <param name="commandText">The stored procedure name or T-SQL command</param>
  /// <param name="commandParameters">An array of SqlParamters used to execute the command</param>
  /// <returns>An int representing the number of rows affected by the command</returns>
  public static int ExecuteNonQuery(SqlTransaction transaction, CommandType commandType, string commandText, params SqlParameter[] commandParameters)
  {
   if( transaction == null ) throw new ArgumentNullException( "transaction" );
   if( transaction != null && transaction.Connection == null ) throw new ArgumentException( "The transaction was rollbacked or commited, please provide an open transaction.", "transaction" );

   // Create a command and prepare it for execution
   SqlCommand cmd = new SqlCommand();
   bool mustCloseConnection = false;
   PrepareCommand(cmd, transaction.Connection, transaction, commandType, commandText, commandParameters, out mustCloseConnection );
       
   // Finally, execute the command
   int retval = cmd.ExecuteNonQuery();
       
   // Detach the SqlParameters from the command object, so they can be used again
   cmd.Parameters.Clear();
   return retval;
  }

  /// <summary>
  /// Execute a stored procedure via a SqlCommand (that returns no resultset) against the specified
  /// SqlTransaction using the provided parameter values.  This method will query the database to discover the parameters for the
  /// stored procedure (the first time each stored procedure is called), and assign the values based on parameter order.
  /// </summary>
  /// <remarks>
  /// This method provides no access to output parameters or the stored procedure's return value parameter.
  ///
  /// e.g.: 
  ///  int result = ExecuteNonQuery(conn, trans, "PublishOrders", 24, 36);
  /// </remarks>
  /// <param name="transaction">A valid SqlTransaction</param>
  /// <param name="spName">The name of the stored procedure</param>
  /// <param name="parameterValues">An array of objects to be assigned as the input values of the stored procedure</param>
  /// <returns>An int representing the number of rows affected by the command</returns>
  public static int ExecuteNonQuery(SqlTransaction transaction, string spName, params object[] parameterValues)
  {
   if( transaction == null ) throw new ArgumentNullException( "transaction" );
   if( transaction != null && transaction.Connection == null ) throw new ArgumentException( "The transaction was rollbacked or commited, please provide an open transaction.", "transaction" );
   if( spName == null || spName.Length == 0 ) throw new ArgumentNullException( "spName" );

   // If we receive parameter values, we need to figure out where they go
   if ((parameterValues != null) && (parameterValues.Length > 0))
   {
    // Pull the parameters for this stored procedure from the parameter cache (or discover them & populate the cache)
    SqlParameter[] commandParameters = SqlHelperParameterCache.GetSpParameterSet(transaction.Connection, spName);

    // Assign the provided values to these parameters based on parameter order
    AssignParameterValues(commandParameters, parameterValues);

    // Call the overload that takes an array of SqlParameters
    return ExecuteNonQuery(transaction, CommandType.StoredProcedure, spName, commandParameters);
   }
   else
   {
    // Otherwise we can just call the SP without params
    return ExecuteNonQuery(transaction, CommandType.StoredProcedure, spName);
   }
  }

  #endregion ExecuteNonQuery

  #region ExecuteDataset

  /// <summary>
  /// Execute a SqlCommand (that returns a resultset and takes no parameters) against the database specified in
  /// the connection string.
  /// </summary>
  /// <remarks>
  /// e.g.: 
  ///  DataSet ds = ExecuteDataset(connString, CommandType.StoredProcedure, "GetOrders");
  /// </remarks>
  /// <param name="connectionString">A valid connection string for a SqlConnection</param>
  /// <param name="commandType">The CommandType (stored procedure, text, etc.)</param>
  /// <param name="commandText">The stored procedure name or T-SQL command</param>
  /// <returns>A dataset containing the resultset generated by the command</returns>
  public static DataSet ExecuteDataset(string connectionString, CommandType commandType, string commandText)
  {
   // Pass through the call providing null for the set of SqlParameters
   return ExecuteDataset(connectionString, commandType, commandText, (SqlParameter[])null);
  }

  /// <summary>
  /// Execute a SqlCommand (that returns a resultset) against the database specified in the connection string
  /// using the provided parameters.
  /// </summary>
  /// <remarks>
  /// e.g.: 
  ///  DataSet ds = ExecuteDataset(connString, CommandType.StoredProcedure, "GetOrders", new SqlParameter("@prodid", 24));
  /// </remarks>
  /// <param name="connectionString">A valid connection string for a SqlConnection</param>
  /// <param name="commandType">The CommandType (stored procedure, text, etc.)</param>
  /// <param name="commandText">The stored procedure name or T-SQL command</param>
  /// <param name="commandParameters">An array of SqlParamters used to execute the command</param>
  /// <returns>A dataset containing the resultset generated by the command</returns>
  public static DataSet ExecuteDataset(string connectionString, CommandType commandType, string commandText, params SqlParameter[] commandParameters)
  {
   if( connectionString == null || connectionString.Length == 0 ) throw new ArgumentNullException( "connectionString" );

   // Create & open a SqlConnection, and dispose of it after we are done
   using (SqlConnection connection = new SqlConnection(connectionString))
   {
    connection.Open();

    // Call the overload that takes a connection in place of the connection string
    return ExecuteDataset(connection, commandType, commandText, commandParameters);
   }
  }

  /// <summary>
  /// Execute a stored procedure via a SqlCommand (that returns a resultset) against the database specified in
  /// the connection string using the provided parameter values.  This method will query the database to discover the parameters for the
  /// stored procedure (the first time each stored procedure is called), and assign the values based on parameter order.
  /// </summary>
  /// <remarks>
  /// This method provides no access to output parameters or the stored procedure's return value parameter.
  ///
  /// e.g.: 
  ///  DataSet ds = ExecuteDataset(connString, "GetOrders", 24, 36);
  /// </remarks>
  /// <param name="connectionString">A valid connection string for a SqlConnection</param>
  /// <param name="spName">The name of the stored procedure</param>
  /// <param name="parameterValues">An array of objects to be assigned as the input values of the stored procedure</param>
  /// <returns>A dataset containing the resultset generated by the command</returns>
  public static DataSet ExecuteDataset(string connectionString, string spName, params object[] parameterValues)
  {
   if( connectionString == null || connectionString.Length == 0 ) throw new ArgumentNullException( "connectionString" );
   if( spName == null || spName.Length == 0 ) throw new ArgumentNullException( "spName" );
   
   // If we receive parameter values, we need to figure out where they go
   if ((parameterValues != null) && (parameterValues.Length > 0))
   {
    // Pull the parameters for this stored procedure from the parameter cache (or discover them & populate the cache)
    SqlParameter[] commandParameters = SqlHelperParameterCache.GetSpParameterSet(connectionString, spName);

    // Assign the provided values to these parameters based on parameter order
    AssignParameterValues(commandParameters, parameterValues);

    // Call the overload that takes an array of SqlParameters
    return ExecuteDataset(connectionString, CommandType.StoredProcedure, spName, commandParameters);
   }
   else
   {
    // Otherwise we can just call the SP without params
    return ExecuteDataset(connectionString, CommandType.StoredProcedure, spName);
   }
  }

  /// <summary>
  /// Execute a SqlCommand (that returns a resultset and takes no parameters) against the provided SqlConnection.
  /// </summary>
  /// <remarks>
  /// e.g.: 
  ///  DataSet ds = ExecuteDataset(conn, CommandType.StoredProcedure, "GetOrders");
  /// </remarks>
  /// <param name="connection">A valid SqlConnection</param>
  /// <param name="commandType">The CommandType (stored procedure, text, etc.)</param>
  /// <param name="commandText">The stored procedure name or T-SQL command</param>
  /// <returns>A dataset containing the resultset generated by the command</returns>
  public static DataSet ExecuteDataset(SqlConnection connection, CommandType commandType, string commandText)
  {
   // Pass through the call providing null for the set of SqlParameters
   return ExecuteDataset(connection, commandType, commandText, (SqlParameter[])null);
  }
  
  /// <summary>
  /// Execute a SqlCommand (that returns a resultset) against the specified SqlConnection
  /// using the provided parameters.
  /// </summary>
  /// <remarks>
  /// e.g.: 
  ///  DataSet ds = ExecuteDataset(conn, CommandType.StoredProcedure, "GetOrders", new SqlParameter("@prodid", 24));
  /// </remarks>
  /// <param name="connection">A valid SqlConnection</param>
  /// <param name="commandType">The CommandType (stored procedure, text, etc.)</param>
  /// <param name="commandText">The stored procedure name or T-SQL command</param>
  /// <param name="commandParameters">An array of SqlParamters used to execute the command</param>
  /// <returns>A dataset containing the resultset generated by the command</returns>
  public static DataSet ExecuteDataset(SqlConnection connection, CommandType commandType, string commandText, params SqlParameter[] commandParameters)
  {
   if( connection == null ) throw new ArgumentNullException( "connection" );

   // Create a command and prepare it for execution
   SqlCommand cmd = new SqlCommand();
   bool mustCloseConnection = false;
   PrepareCommand(cmd, connection, (SqlTransaction)null, commandType, commandText, commandParameters, out mustCloseConnection );
       
   // Create the DataAdapter & DataSet
   using( SqlDataAdapter da = new SqlDataAdapter(cmd) )
   {
    DataSet ds = new DataSet();

    // Fill the DataSet using default values for DataTable names, etc
    da.Fill(ds);
    
    // Detach the SqlParameters from the command object, so they can be used again
    cmd.Parameters.Clear();

    if( mustCloseConnection )
     connection.Close();

    // Return the dataset
    return ds;
   } 
  }
  
  /// <summary>
  /// Execute a stored procedure via a SqlCommand (that returns a resultset) against the specified SqlConnection
  /// using the provided parameter values.  This method will query the database to discover the parameters for the
  /// stored procedure (the first time each stored procedure is called), and assign the values based on parameter order.
  /// </summary>
  /// <remarks>
  /// This method provides no access to output parameters or the stored procedure's return value parameter.
  ///
  /// e.g.: 
  ///  DataSet ds = ExecuteDataset(conn, "GetOrders", 24, 36);
  /// </remarks>
  /// <param name="connection">A valid SqlConnection</param>
  /// <param name="spName">The name of the stored procedure</param>
  /// <param name="parameterValues">An array of objects to be assigned as the input values of the stored procedure</param>
  /// <returns>A dataset containing the resultset generated by the command</returns>
  public static DataSet ExecuteDataset(SqlConnection connection, string spName, params object[] parameterValues)
  {
   if( connection == null ) throw new ArgumentNullException( "connection" );
   if( spName == null || spName.Length == 0 ) throw new ArgumentNullException( "spName" );

   // If we receive parameter values, we need to figure out where they go
   if ((parameterValues != null) && (parameterValues.Length > 0))
   {
    // Pull the parameters for this stored procedure from the parameter cache (or discover them & populate the cache)
    SqlParameter[] commandParameters = SqlHelperParameterCache.GetSpParameterSet(connection, spName);

    // Assign the provided values to these parameters based on parameter order
    AssignParameterValues(commandParameters, parameterValues);

    // Call the overload that takes an array of SqlParameters
    return ExecuteDataset(connection, CommandType.StoredProcedure, spName, commandParameters);
   }
   else
   {
    // Otherwise we can just call the SP without params
    return ExecuteDataset(connection, CommandType.StoredProcedure, spName);
   }
  }

  /// <summary>
  /// Execute a SqlCommand (that returns a resultset and takes no parameters) against the provided SqlTransaction.
  /// </summary>
  /// <remarks>
  /// e.g.: 
  ///  DataSet ds = ExecuteDataset(trans, CommandType.StoredProcedure, "GetOrders");
  /// </remarks>
  /// <param name="transaction">A valid SqlTransaction</param>
  /// <param name="commandType">The CommandType (stored procedure, text, etc.)</param>
  /// <param name="commandText">The stored procedure name or T-SQL command</param>
  /// <returns>A dataset containing the resultset generated by the command</returns>
  public static DataSet ExecuteDataset(SqlTransaction transaction, CommandType commandType, string commandText)
  {
   // Pass through the call providing null for the set of SqlParameters
   return ExecuteDataset(transaction, commandType, commandText, (SqlParameter[])null);
  }
  
  /// <summary>
  /// Execute a SqlCommand (that returns a resultset) against the specified SqlTransaction
  /// using the provided parameters.
  /// </summary>
  /// <remarks>
  /// e.g.: 
  ///  DataSet ds = ExecuteDataset(trans, CommandType.StoredProcedure, "GetOrders", new SqlParameter("@prodid", 24));
  /// </remarks>
  /// <param name="transaction">A valid SqlTransaction</param>
  /// <param name="commandType">The CommandType (stored procedure, text, etc.)</param>
  /// <param name="commandText">The stored procedure name or T-SQL command</param>
  /// <param name="commandParameters">An array of SqlParamters used to execute the command</param>
  /// <returns>A dataset containing the resultset generated by the command</returns>
  public static DataSet ExecuteDataset(SqlTransaction transaction, CommandType commandType, string commandText, params SqlParameter[] commandParameters)
  {
   if( transaction == null ) throw new ArgumentNullException( "transaction" );
   if( transaction != null && transaction.Connection == null ) throw new ArgumentException( "The transaction was rollbacked or commited, please provide an open transaction.", "transaction" );

   // Create a command and prepare it for execution
   SqlCommand cmd = new SqlCommand();
   bool mustCloseConnection = false;
   PrepareCommand(cmd, transaction.Connection, transaction, commandType, commandText, commandParameters, out mustCloseConnection );
       
   // Create the DataAdapter & DataSet
   using( SqlDataAdapter da = new SqlDataAdapter(cmd) )
   {
    DataSet ds = new DataSet();

    // Fill the DataSet using default values for DataTable names, etc
    da.Fill(ds);
       
    // Detach the SqlParameters from the command object, so they can be used again
    cmd.Parameters.Clear();

    // Return the dataset
    return ds;
   } 
  }
  
  /// <summary>
  /// Execute a stored procedure via a SqlCommand (that returns a resultset) against the specified
  /// SqlTransaction using the provided parameter values.  This method will query the database to discover the parameters for the
  /// stored procedure (the first time each stored procedure is called), and assign the values based on parameter order.
  /// </summary>
  /// <remarks>
  /// This method provides no access to output parameters or the stored procedure's return value parameter.
  ///
  /// e.g.: 
  ///  DataSet ds = ExecuteDataset(trans, "GetOrders", 24, 36);
  /// </remarks>
  /// <param name="transaction">A valid SqlTransaction</param>
  /// <param name="spName">The name of the stored procedure</param>
  /// <param name="parameterValues">An array of objects to be assigned as the input values of the stored procedure</param>
  /// <returns>A dataset containing the resultset generated by the command</returns>
  public static DataSet ExecuteDataset(SqlTransaction transaction, string spName, params object[] parameterValues)
  {
   if( transaction == null ) throw new ArgumentNullException( "transaction" );
   if( transaction != null && transaction.Connection == null ) throw new ArgumentException( "The transaction was rollbacked or commited, please provide an open transaction.", "transaction" );
   if( spName == null || spName.Length == 0 ) throw new ArgumentNullException( "spName" );
   
   // If we receive parameter values, we need to figure out where they go
   if ((parameterValues != null) && (parameterValues.Length > 0))
   {
    // Pull the parameters for this stored procedure from the parameter cache (or discover them & populate the cache)
    SqlParameter[] commandParameters = SqlHelperParameterCache.GetSpParameterSet(transaction.Connection, spName);

    // Assign the provided values to these parameters based on parameter order
    AssignParameterValues(commandParameters, parameterValues);

    // Call the overload that takes an array of SqlParameters
    return ExecuteDataset(transaction, CommandType.StoredProcedure, spName, commandParameters);
   }
   else
   {
    // Otherwise we can just call the SP without params
    return ExecuteDataset(transaction, CommandType.StoredProcedure, spName);
   }
  }

  #endregion ExecuteDataset
  
  #region ExecuteReader

  /// <summary>
  /// This enum is used to indicate whether the connection was provided by the caller, or created by SqlHelper, so that
  /// we can set the appropriate CommandBehavior when calling ExecuteReader()
  /// </summary>
  private enum SqlConnectionOwnership 
  {
   /// <summary>Connection is owned and managed by SqlHelper</summary>
   Internal,
   /// <summary>Connection is owned and managed by the caller</summary>
   External
  }

  /// <summary>
  /// Create and prepare a SqlCommand, and call ExecuteReader with the appropriate CommandBehavior.
  /// </summary>
  /// <remarks>
  /// If we created and opened the connection, we want the connection to be closed when the DataReader is closed.
  ///
  /// If the caller provided the connection, we want to leave it to them to manage.
  /// </remarks>
  /// <param name="connection">A valid SqlConnection, on which to execute this command</param>
  /// <param name="transaction">A valid SqlTransaction, or 'null'</param>
  /// <param name="commandType">The CommandType (stored procedure, text, etc.)</param>
  /// <param name="commandText">The stored procedure name or T-SQL command</param>
  /// <param name="commandParameters">An array of SqlParameters to be associated with the command or 'null' if no parameters are required</param>
  /// <param name="connectionOwnership">Indicates whether the connection parameter was provided by the caller, or created by SqlHelper</param>
  /// <returns>SqlDataReader containing the results of the command</returns>
  private static SqlDataReader ExecuteReader(SqlConnection connection, SqlTransaction transaction, CommandType commandType, string commandText, SqlParameter[] commandParameters, SqlConnectionOwnership connectionOwnership)
  { 
   if( connection == null ) throw new ArgumentNullException( "connection" );

   bool mustCloseConnection = false;
   // Create a command and prepare it for execution
   SqlCommand cmd = new SqlCommand();
   try
   {
    PrepareCommand(cmd, connection, transaction, commandType, commandText, commandParameters, out mustCloseConnection );
   
    // Create a reader
    SqlDataReader dataReader;

    // Call ExecuteReader with the appropriate CommandBehavior
    if (connectionOwnership == SqlConnectionOwnership.External)
    {
     dataReader = cmd.ExecuteReader();
    }
    else
    {
     dataReader = cmd.ExecuteReader(CommandBehavior.CloseConnection);
    }
   
    // Detach the SqlParameters from the command object, so they can be used again.
    // HACK: There is a problem here, the output parameter values are fletched
    // when the reader is closed, so if the parameters are detached from the command
    // then the SqlReader can磘 set its values.
    // When this happen, the parameters can磘 be used again in other command.
    bool canClear = true;
    foreach(SqlParameter commandParameter in cmd.Parameters)
    {
     if (commandParameter.Direction != ParameterDirection.Input)
      canClear = false;
    }
           
    if (canClear)
    {
     cmd.Parameters.Clear();
    }

    return dataReader;
   }
   catch
   {
    if( mustCloseConnection )
     connection.Close();
    throw;
   }
  }

  /// <summary>
  /// Execute a SqlCommand (that returns a resultset and takes no parameters) against the database specified in
  /// the connection string.
  /// </summary>
  /// <remarks>
  /// e.g.: 
  ///  SqlDataReader dr = ExecuteReader(connString, CommandType.StoredProcedure, "GetOrders");
  /// </remarks>
  /// <param name="connectionString">A valid connection string for a SqlConnection</param>
  /// <param name="commandType">The CommandType (stored procedure, text, etc.)</param>
  /// <param name="commandText">The stored procedure name or T-SQL command</param>
  /// <returns>A SqlDataReader containing the resultset generated by the command</returns>
  public static SqlDataReader ExecuteReader(string connectionString, CommandType commandType, string commandText)
  {
   // Pass through the call providing null for the set of SqlParameters
   return ExecuteReader(connectionString, commandType, commandText, (SqlParameter[])null);
  }

  /// <summary>
  /// Execute a SqlCommand (that returns a resultset) against the database specified in the connection string
  /// using the provided parameters.
  /// </summary>
  /// <remarks>
  /// e.g.: 
  ///  SqlDataReader dr = ExecuteReader(connString, CommandType.StoredProcedure, "GetOrders", new SqlParameter("@prodid", 24));
  /// </remarks>
  /// <param name="connectionString">A valid connection string for a SqlConnection</param>
  /// <param name="commandType">The CommandType (stored procedure, text, etc.)</param>
  /// <param name="commandText">The stored procedure name or T-SQL command</param>
  /// <param name="commandParameters">An array of SqlParamters used to execute the command</param>
  /// <returns>A SqlDataReader containing the resultset generated by the command</returns>
  public static SqlDataReader ExecuteReader(string connectionString, CommandType commandType, string commandText, params SqlParameter[] commandParameters)
  {
   if( connectionString == null || connectionString.Length == 0 ) throw new ArgumentNullException( "connectionString" );
   SqlConnection connection = null;
   try
   {
    connection = new SqlConnection(connectionString);
    connection.Open();

    // Call the private overload that takes an internally owned connection in place of the connection string
    return ExecuteReader(connection, null, commandType, commandText, commandParameters,SqlConnectionOwnership.Internal);
   }
   catch
   {
    // If we fail to return the SqlDatReader, we need to close the connection ourselves
    if( connection != null ) connection.Close();
    throw;
   }
           
  }

  /// <summary>
  /// Execute a stored procedure via a SqlCommand (that returns a resultset) against the database specified in
  /// the connection string using the provided parameter values.  This method will query the database to discover the parameters for the
  /// stored procedure (the first time each stored procedure is called), and assign the values based on parameter order.
  /// </summary>
  /// <remarks>
  /// This method provides no access to output parameters or the stored procedure's return value parameter.
  ///
  /// e.g.: 
  ///  SqlDataReader dr = ExecuteReader(connString, "GetOrders", 24, 36);
  /// </remarks>
  /// <param name="connectionString">A valid connection string for a SqlConnection</param>
  /// <param name="spName">The name of the stored procedure</param>
  /// <param name="parameterValues">An array of objects to be assigned as the input values of the stored procedure</param>
  /// <returns>A SqlDataReader containing the resultset generated by the command</returns>
  public static SqlDataReader ExecuteReader(string connectionString, string spName, params object[] parameterValues)
  {
   if( connectionString == null || connectionString.Length == 0 ) throw new ArgumentNullException( "connectionString" );
   if( spName == null || spName.Length == 0 ) throw new ArgumentNullException( "spName" );
   
   // If we receive parameter values, we need to figure out where they go
   if ((parameterValues != null) && (parameterValues.Length > 0))
   {
    SqlParameter[] commandParameters = SqlHelperParameterCache.GetSpParameterSet(connectionString, spName);

    AssignParameterValues(commandParameters, parameterValues);

    return ExecuteReader(connectionString, CommandType.StoredProcedure, spName, commandParameters);
   }
   else
   {
    // Otherwise we can just call the SP without params
    return ExecuteReader(connectionString, CommandType.StoredProcedure, spName);
   }
  }

  /// <summary>
  /// Execute a SqlCommand (that returns a resultset and takes no parameters) against the provided SqlConnection.
  /// </summary>
  /// <remarks>
  /// e.g.: 
  ///  SqlDataReader dr = ExecuteReader(conn, CommandType.StoredProcedure, "GetOrders");
  /// </remarks>
  /// <param name="connection">A valid SqlConnection</param>
  /// <param name="commandType">The CommandType (stored procedure, text, etc.)</param>
  /// <param name="commandText">The stored procedure name or T-SQL command</param>
  /// <returns>A SqlDataReader containing the resultset generated by the command</returns>
  public static SqlDataReader ExecuteReader(SqlConnection connection, CommandType commandType, string commandText)
  {
   // Pass through the call providing null for the set of SqlParameters
   return ExecuteReader(connection, commandType, commandText, (SqlParameter[])null);
  }

  /// <summary>
  /// Execute a SqlCommand (that returns a resultset) against the specified SqlConnection
  /// using the provided parameters.
  /// </summary>
  /// <remarks>
  /// e.g.: 
  ///  SqlDataReader dr = ExecuteReader(conn, CommandType.StoredProcedure, "GetOrders", new SqlParameter("@prodid", 24));
  /// </remarks>
  /// <param name="connection">A valid SqlConnection</param>
  /// <param name="commandType">The CommandType (stored procedure, text, etc.)</param>
  /// <param name="commandText">The stored procedure name or T-SQL command</param>
  /// <param name="commandParameters">An array of SqlParamters used to execute the command</param>
  /// <returns>A SqlDataReader containing the resultset generated by the command</returns>
  public static SqlDataReader ExecuteReader(SqlConnection connection, CommandType commandType, string commandText, params SqlParameter[] commandParameters)
  {
   // Pass through the call to the private overload using a null transaction value and an externally owned connection
   return ExecuteReader(connection, (SqlTransaction)null, commandType, commandText, commandParameters, SqlConnectionOwnership.External);
  }

  /// <summary>
  /// Execute a stored procedure via a SqlCommand (that returns a resultset) against the specified SqlConnection
  /// using the provided parameter values.  This method will query the database to discover the parameters for the
  /// stored procedure (the first time each stored procedure is called), and assign the values based on parameter order.
  /// </summary>
  /// <remarks>
  /// This method provides no access to output parameters or the stored procedure's return value parameter.
  ///
  /// e.g.: 
  ///  SqlDataReader dr = ExecuteReader(conn, "GetOrders", 24, 36);
  /// </remarks>
  /// <param name="connection">A valid SqlConnection</param>
  /// <param name="spName">The name of the stored procedure</param>
  /// <param name="parameterValues">An array of objects to be assigned as the input values of the stored procedure</param>
  /// <returns>A SqlDataReader containing the resultset generated by the command</returns>
  public static SqlDataReader ExecuteReader(SqlConnection connection, string spName, params object[] parameterValues)
  {
   if( connection == null ) throw new ArgumentNullException( "connection" );
   if( spName == null || spName.Length == 0 ) throw new ArgumentNullException( "spName" );

   // If we receive parameter values, we need to figure out where they go
   if ((parameterValues != null) && (parameterValues.Length > 0))
   {
    SqlParameter[] commandParameters = SqlHelperParameterCache.GetSpParameterSet(connection, spName);

    AssignParameterValues(commandParameters, parameterValues);

    return ExecuteReader(connection, CommandType.StoredProcedure, spName, commandParameters);
   }
   else
   {
    // Otherwise we can just call the SP without params
    return ExecuteReader(connection, CommandType.StoredProcedure, spName);
   }
  }

  /// <summary>
  /// Execute a SqlCommand (that returns a resultset and takes no parameters) against the provided SqlTransaction.
  /// </summary>
  /// <remarks>
  /// e.g.: 
  ///  SqlDataReader dr = ExecuteReader(trans, CommandType.StoredProcedure, "GetOrders");
  /// </remarks>
  /// <param name="transaction">A valid SqlTransaction</param>
  /// <param name="commandType">The CommandType (stored procedure, text, etc.)</param>
  /// <param name="commandText">The stored procedure name or T-SQL command</param>
  /// <returns>A SqlDataReader containing the resultset generated by the command</returns>
  public static SqlDataReader ExecuteReader(SqlTransaction transaction, CommandType commandType, string commandText)
  {
   // Pass through the call providing null for the set of SqlParameters
   return ExecuteReader(transaction, commandType, commandText, (SqlParameter[])null);
  }

  /// <summary>
  /// Execute a SqlCommand (that returns a resultset) against the specified SqlTransaction
  /// using the provided parameters.
  /// </summary>
  /// <remarks>
  /// e.g.: 
  ///   SqlDataReader dr = ExecuteReader(trans, CommandType.StoredProcedure, "GetOrders", new SqlParameter("@prodid", 24));
  /// </remarks>
  /// <param name="transaction">A valid SqlTransaction</param>
  /// <param name="commandType">The CommandType (stored procedure, text, etc.)</param>
  /// <param name="commandText">The stored procedure name or T-SQL command</param>
  /// <param name="commandParameters">An array of SqlParamters used to execute the command</param>
  /// <returns>A SqlDataReader containing the resultset generated by the command</returns>
  public static SqlDataReader ExecuteReader(SqlTransaction transaction, CommandType commandType, string commandText, params SqlParameter[] commandParameters)
  {
   if( transaction == null ) throw new ArgumentNullException( "transaction" );
   if( transaction != null && transaction.Connection == null ) throw new ArgumentException( "The transaction was rollbacked or commited, please provide an open transaction.", "transaction" );

   // Pass through to private overload, indicating that the connection is owned by the caller
   return ExecuteReader(transaction.Connection, transaction, commandType, commandText, commandParameters, SqlConnectionOwnership.External);
  }

  /// <summary>
  /// Execute a stored procedure via a SqlCommand (that returns a resultset) against the specified
  /// SqlTransaction using the provided parameter values.  This method will query the database to discover the parameters for the
  /// stored procedure (the first time each stored procedure is called), and assign the values based on parameter order.
  /// </summary>
  /// <remarks>
  /// This method provides no access to output parameters or the stored procedure's return value parameter.
  ///
  /// e.g.: 
  ///  SqlDataReader dr = ExecuteReader(trans, "GetOrders", 24, 36);
  /// </remarks>
  /// <param name="transaction">A valid SqlTransaction</param>
  /// <param name="spName">The name of the stored procedure</param>
  /// <param name="parameterValues">An array of objects to be assigned as the input values of the stored procedure</param>
  /// <returns>A SqlDataReader containing the resultset generated by the command</returns>
  public static SqlDataReader ExecuteReader(SqlTransaction transaction, string spName, params object[] parameterValues)
  {
   if( transaction == null ) throw new ArgumentNullException( "transaction" );
   if( transaction != null && transaction.Connection == null ) throw new ArgumentException( "The transaction was rollbacked or commited, please provide an open transaction.", "transaction" );
   if( spName == null || spName.Length == 0 ) throw new ArgumentNullException( "spName" );

   // If we receive parameter values, we need to figure out where they go
   if ((parameterValues != null) && (parameterValues.Length > 0))
   {
    SqlParameter[] commandParameters = SqlHelperParameterCache.GetSpParameterSet(transaction.Connection, spName);

    AssignParameterValues(commandParameters, parameterValues);

    return ExecuteReader(transaction, CommandType.StoredProcedure, spName, commandParameters);
   }
   else
   {
    // Otherwise we can just call the SP without params
    return ExecuteReader(transaction, CommandType.StoredProcedure, spName);
   }
  }

  #endregion ExecuteReader

  #region ExecuteScalar
  
  /// <summary>
  /// Execute a SqlCommand (that returns a 1x1 resultset and takes no parameters) against the database specified in
  /// the connection string.
  /// </summary>
  /// <remarks>
  /// e.g.: 
  ///  int orderCount = (int)ExecuteScalar(connString, CommandType.StoredProcedure, "GetOrderCount");
  /// </remarks>
  /// <param name="connectionString">A valid connection string for a SqlConnection</param>
  /// <param name="commandType">The CommandType (stored procedure, text, etc.)</param>
  /// <param name="commandText">The stored procedure name or T-SQL command</param>
  /// <returns>An object containing the value in the 1x1 resultset generated by the command</returns>
  public static object ExecuteScalar(string connectionString, CommandType commandType, string commandText)
  {
   // Pass through the call providing null for the set of SqlParameters
   return ExecuteScalar(connectionString, commandType, commandText, (SqlParameter[])null);
  }

  /// <summary>
  /// Execute a SqlCommand (that returns a 1x1 resultset) against the database specified in the connection string
  /// using the provided parameters.
  /// </summary>
  /// <remarks>
  /// e.g.: 
  ///  int orderCount = (int)ExecuteScalar(connString, CommandType.StoredProcedure, "GetOrderCount", new SqlParameter("@prodid", 24));
  /// </remarks>
  /// <param name="connectionString">A valid connection string for a SqlConnection</param>
  /// <param name="commandType">The CommandType (stored procedure, text, etc.)</param>
  /// <param name="commandText">The stored procedure name or T-SQL command</param>
  /// <param name="commandParameters">An array of SqlParamters used to execute the command</param>
  /// <returns>An object containing the value in the 1x1 resultset generated by the command</returns>
  public static object ExecuteScalar(string connectionString, CommandType commandType, string commandText, params SqlParameter[] commandParameters)
  {
   if( connectionString == null || connectionString.Length == 0 ) throw new ArgumentNullException( "connectionString" );
   // Create & open a SqlConnection, and dispose of it after we are done
   using (SqlConnection connection = new SqlConnection(connectionString))
   {
    connection.Open();

    // Call the overload that takes a connection in place of the connection string
    return ExecuteScalar(connection, commandType, commandText, commandParameters);
   }
  }

  /// <summary>
  /// Execute a stored procedure via a SqlCommand (that returns a 1x1 resultset) against the database specified in
  /// the connection string using the provided parameter values.  This method will query the database to discover the parameters for the
  /// stored procedure (the first time each stored procedure is called), and assign the values based on parameter order.
  /// </summary>
  /// <remarks>
  /// This method provides no access to output parameters or the stored procedure's return value parameter.
  ///
  /// e.g.: 
  ///  int orderCount = (int)ExecuteScalar(connString, "GetOrderCount", 24, 36);
  /// </remarks>
  /// <param name="connectionString">A valid connection string for a SqlConnection</param>
  /// <param name="spName">The name of the stored procedure</param>
  /// <param name="parameterValues">An array of objects to be assigned as the input values of the stored procedure</param>
  /// <returns>An object containing the value in the 1x1 resultset generated by the command</returns>
  public static object ExecuteScalar(string connectionString, string spName, params object[] parameterValues)
  {
   if( connectionString == null || connectionString.Length == 0 ) throw new ArgumentNullException( "connectionString" );
   if( spName == null || spName.Length == 0 ) throw new ArgumentNullException( "spName" );
   
   // If we receive parameter values, we need to figure out where they go
   if ((parameterValues != null) && (parameterValues.Length > 0))
   {
    // Pull the parameters for this stored procedure from the parameter cache (or discover them & populate the cache)
    SqlParameter[] commandParameters = SqlHelperParameterCache.GetSpParameterSet(connectionString, spName);

    // Assign the provided values to these parameters based on parameter order
    AssignParameterValues(commandParameters, parameterValues);

    // Call the overload that takes an array of SqlParameters
    return ExecuteScalar(connectionString, CommandType.StoredProcedure, spName, commandParameters);
   }
   else
   {
    // Otherwise we can just call the SP without params
    return ExecuteScalar(connectionString, CommandType.StoredProcedure, spName);
   }
  }

  /// <summary>
  /// Execute a SqlCommand (that returns a 1x1 resultset and takes no parameters) against the provided SqlConnection.
  /// </summary>
  /// <remarks>
  /// e.g.: 
  ///  int orderCount = (int)ExecuteScalar(conn, CommandType.StoredProcedure, "GetOrderCount");
  /// </remarks>
  /// <param name="connection">A valid SqlConnection</param>
  /// <param name="commandType">The CommandType (stored procedure, text, etc.)</param>
  /// <param name="commandText">The stored procedure name or T-SQL command</param>
  /// <returns>An object containing the value in the 1x1 resultset generated by the command</returns>
  public static object ExecuteScalar(SqlConnection connection, CommandType commandType, string commandText)
  {
   // Pass through the call providing null for the set of SqlParameters
   return ExecuteScalar(connection, commandType, commandText, (SqlParameter[])null);
  }

  /// <summary>
  /// Execute a SqlCommand (that returns a 1x1 resultset) against the specified SqlConnection
  /// using the provided parameters.
  /// </summary>
  /// <remarks>
  /// e.g.: 
  ///  int orderCount = (int)ExecuteScalar(conn, CommandType.StoredProcedure, "GetOrderCount", new SqlParameter("@prodid", 24));
  /// </remarks>
  /// <param name="connection">A valid SqlConnection</param>
  /// <param name="commandType">The CommandType (stored procedure, text, etc.)</param>
  /// <param name="commandText">The stored procedure name or T-SQL command</param>
  /// <param name="commandParameters">An array of SqlParamters used to execute the command</param>
  /// <returns>An object containing the value in the 1x1 resultset generated by the command</returns>
  public static object ExecuteScalar(SqlConnection connection, CommandType commandType, string commandText, params SqlParameter[] commandParameters)
  {
   if( connection == null ) throw new ArgumentNullException( "connection" );

   // Create a command and prepare it for execution
   SqlCommand cmd = new SqlCommand();

   bool mustCloseConnection = false;
   PrepareCommand(cmd, connection, (SqlTransaction)null, commandType, commandText, commandParameters, out mustCloseConnection );
       
   // Execute the command & return the results
   object retval = cmd.ExecuteScalar();
       
   // Detach the SqlParameters from the command object, so they can be used again
   cmd.Parameters.Clear();

   if( mustCloseConnection )
    connection.Close();

   return retval;
  }

  /// <summary>
  /// Execute a stored procedure via a SqlCommand (that returns a 1x1 resultset) against the specified SqlConnection
  /// using the provided parameter values.  This method will query the database to discover the parameters for the
  /// stored procedure (the first time each stored procedure is called), and assign the values based on parameter order.
  /// </summary>
  /// <remarks>
  /// This method provides no access to output parameters or the stored procedure's return value parameter.
  ///
  /// e.g.: 
  ///  int orderCount = (int)ExecuteScalar(conn, "GetOrderCount", 24, 36);
  /// </remarks>
  /// <param name="connection">A valid SqlConnection</param>
  /// <param name="spName">The name of the stored procedure</param>
  /// <param name="parameterValues">An array of objects to be assigned as the input values of the stored procedure</param>
  /// <returns>An object containing the value in the 1x1 resultset generated by the command</returns>
  public static object ExecuteScalar(SqlConnection connection, string spName, params object[] parameterValues)
  {
   if( connection == null ) throw new ArgumentNullException( "connection" );
   if( spName == null || spName.Length == 0 ) throw new ArgumentNullException( "spName" );

   // If we receive parameter values, we need to figure out where they go
   if ((parameterValues != null) && (parameterValues.Length > 0))
   {
    // Pull the parameters for this stored procedure from the parameter cache (or discover them & populate the cache)
    SqlParameter[] commandParameters = SqlHelperParameterCache.GetSpParameterSet(connection, spName);

    // Assign the provided values to these parameters based on parameter order
    AssignParameterValues(commandParameters, parameterValues);

    // Call the overload that takes an array of SqlParameters
    return ExecuteScalar(connection, CommandType.StoredProcedure, spName, commandParameters);
   }
   else
   {
    // Otherwise we can just call the SP without params
    return ExecuteScalar(connection, CommandType.StoredProcedure, spName);
   }
  }

  /// <summary>
  /// Execute a SqlCommand (that returns a 1x1 resultset and takes no parameters) against the provided SqlTransaction.
  /// </summary>
  /// <remarks>
  /// e.g.: 
  ///  int orderCount = (int)ExecuteScalar(trans, CommandType.StoredProcedure, "GetOrderCount");
  /// </remarks>
  /// <param name="transaction">A valid SqlTransaction</param>
  /// <param name="commandType">The CommandType (stored procedure, text, etc.)</param>
  /// <param name="commandText">The stored procedure name or T-SQL command</param>
  /// <returns>An object containing the value in the 1x1 resultset generated by the command</returns>
  public static object ExecuteScalar(SqlTransaction transaction, CommandType commandType, string commandText)
  {
   // Pass through the call providing null for the set of SqlParameters
   return ExecuteScalar(transaction, commandType, commandText, (SqlParameter[])null);
  }

  /// <summary>
  /// Execute a SqlCommand (that returns a 1x1 resultset) against the specified SqlTransaction
  /// using the provided parameters.
  /// </summary>
  /// <remarks>
  /// e.g.: 
  ///  int orderCount = (int)ExecuteScalar(trans, CommandType.StoredProcedure, "GetOrderCount", new SqlParameter("@prodid", 24));
  /// </remarks>
  /// <param name="transaction">A valid SqlTransaction</param>
  /// <param name="commandType">The CommandType (stored procedure, text, etc.)</param>
  /// <param name="commandText">The stored procedure name or T-SQL command</param>
  /// <param name="commandParameters">An array of SqlParamters used to execute the command</param>
  /// <returns>An object containing the value in the 1x1 resultset generated by the command</returns>
  public static object ExecuteScalar(SqlTransaction transaction, CommandType commandType, string commandText, params SqlParameter[] commandParameters)
  {
   if( transaction == null ) throw new ArgumentNullException( "transaction" );
   if( transaction != null && transaction.Connection == null ) throw new ArgumentException( "The transaction was rollbacked or commited, please provide an open transaction.", "transaction" );

   // Create a command and prepare it for execution
   SqlCommand cmd = new SqlCommand();
   bool mustCloseConnection = false;
   PrepareCommand(cmd, transaction.Connection, transaction, commandType, commandText, commandParameters, out mustCloseConnection );
       
   // Execute the command & return the results
   object retval = cmd.ExecuteScalar();
       
   // Detach the SqlParameters from the command object, so they can be used again
   cmd.Parameters.Clear();
   return retval;
  }

  /// <summary>
  /// Execute a stored procedure via a SqlCommand (that returns a 1x1 resultset) against the specified
  /// SqlTransaction using the provided parameter values.  This method will query the database to discover the parameters for the
  /// stored procedure (the first time each stored procedure is called), and assign the values based on parameter order.
  /// </summary>
  /// <remarks>
  /// This method provides no access to output parameters or the stored procedure's return value parameter.
  ///
  /// e.g.: 
  ///  int orderCount = (int)ExecuteScalar(trans, "GetOrderCount", 24, 36);
  /// </remarks>
  /// <param name="transaction">A valid SqlTransaction</param>
  /// <param name="spName">The name of the stored procedure</param>
  /// <param name="parameterValues">An array of objects to be assigned as the input values of the stored procedure</param>
  /// <returns>An object containing the value in the 1x1 resultset generated by the command</returns>
  public static object ExecuteScalar(SqlTransaction transaction, string spName, params object[] parameterValues)
  {
   if( transaction == null ) throw new ArgumentNullException( "transaction" );
   if( transaction != null && transaction.Connection == null ) throw new ArgumentException( "The transaction was rollbacked or commited, please provide an open transaction.", "transaction" );
   if( spName == null || spName.Length == 0 ) throw new ArgumentNullException( "spName" );

   // If we receive parameter values, we need to figure out where they go
   if ((parameterValues != null) && (parameterValues.Length > 0))
   {
    // PPull the parameters for this stored procedure from the parameter cache (or discover them & populate the cache)
    SqlParameter[] commandParameters = SqlHelperParameterCache.GetSpParameterSet(transaction.Connection, spName);

    // Assign the provided values to these parameters based on parameter order
    AssignParameterValues(commandParameters, parameterValues);

    // Call the overload that takes an array of SqlParameters
    return ExecuteScalar(transaction, CommandType.StoredProcedure, spName, commandParameters);
   }
   else
   {
    // Otherwise we can just call the SP without params
    return ExecuteScalar(transaction, CommandType.StoredProcedure, spName);
   }
  }

  #endregion ExecuteScalar 

  #region ExecuteXmlReader
  /// <summary>
  /// Execute a SqlCommand (that returns a resultset and takes no parameters) against the provided SqlConnection.
  /// </summary>
  /// <remarks>
  /// e.g.: 
  ///  XmlReader r = ExecuteXmlReader(conn, CommandType.StoredProcedure, "GetOrders");
  /// </remarks>
  /// <param name="connection">A valid SqlConnection</param>
  /// <param name="commandType">The CommandType (stored procedure, text, etc.)</param>
  /// <param name="commandText">The stored procedure name or T-SQL command using "FOR XML AUTO"</param>
  /// <returns>An XmlReader containing the resultset generated by the command</returns>
  public static XmlReader ExecuteXmlReader(SqlConnection connection, CommandType commandType, string commandText)
  {
   // Pass through the call providing null for the set of SqlParameters
   return ExecuteXmlReader(connection, commandType, commandText, (SqlParameter[])null);
  }

  /// <summary>
  /// Execute a SqlCommand (that returns a resultset) against the specified SqlConnection
  /// using the provided parameters.
  /// </summary>
  /// <remarks>
  /// e.g.: 
  ///  XmlReader r = ExecuteXmlReader(conn, CommandType.StoredProcedure, "GetOrders", new SqlParameter("@prodid", 24));
  /// </remarks>
  /// <param name="connection">A valid SqlConnection</param>
  /// <param name="commandType">The CommandType (stored procedure, text, etc.)</param>
  /// <param name="commandText">The stored procedure name or T-SQL command using "FOR XML AUTO"</param>
  /// <param name="commandParameters">An array of SqlParamters used to execute the command</param>
  /// <returns>An XmlReader containing the resultset generated by the command</returns>
  public static XmlReader ExecuteXmlReader(SqlConnection connection, CommandType commandType, string commandText, params SqlParameter[] commandParameters)
  {
   if( connection == null ) throw new ArgumentNullException( "connection" );

   bool mustCloseConnection = false;
   // Create a command and prepare it for execution
   SqlCommand cmd = new SqlCommand();
   try
   {
    PrepareCommand(cmd, connection, (SqlTransaction)null, commandType, commandText, commandParameters, out mustCloseConnection );
   
    // Create the DataAdapter & DataSet
    XmlReader retval = cmd.ExecuteXmlReader();
   
    // Detach the SqlParameters from the command object, so they can be used again
    cmd.Parameters.Clear();

    return retval;
   }
   catch
   { 
    if( mustCloseConnection )
     connection.Close();
    throw;
   }
  }

  /// <summary>
  /// Execute a stored procedure via a SqlCommand (that returns a resultset) against the specified SqlConnection
  /// using the provided parameter values.  This method will query the database to discover the parameters for the
  /// stored procedure (the first time each stored procedure is called), and assign the values based on parameter order.
  /// </summary>
  /// <remarks>
  /// This method provides no access to output parameters or the stored procedure's return value parameter.
  ///
  /// e.g.: 
  ///  XmlReader r = ExecuteXmlReader(conn, "GetOrders", 24, 36);
  /// </remarks>
  /// <param name="connection">A valid SqlConnection</param>
  /// <param name="spName">The name of the stored procedure using "FOR XML AUTO"</param>
  /// <param name="parameterValues">An array of objects to be assigned as the input values of the stored procedure</param>
  /// <returns>An XmlReader containing the resultset generated by the command</returns>
  public static XmlReader ExecuteXmlReader(SqlConnection connection, string spName, params object[] parameterValues)
  {
   if( connection == null ) throw new ArgumentNullException( "connection" );
   if( spName == null || spName.Length == 0 ) throw new ArgumentNullException( "spName" );

   // If we receive parameter values, we need to figure out where they go
   if ((parameterValues != null) && (parameterValues.Length > 0))
   {
    // Pull the parameters for this stored procedure from the parameter cache (or discover them & populate the cache)
    SqlParameter[] commandParameters = SqlHelperParameterCache.GetSpParameterSet(connection, spName);

    // Assign the provided values to these parameters based on parameter order
    AssignParameterValues(commandParameters, parameterValues);

    // Call the overload that takes an array of SqlParameters
    return ExecuteXmlReader(connection, CommandType.StoredProcedure, spName, commandParameters);
   }
   else
   {
    // Otherwise we can just call the SP without params
    return ExecuteXmlReader(connection, CommandType.StoredProcedure, spName);
   }
  }

  /// <summary>
  /// Execute a SqlCommand (that returns a resultset and takes no parameters) against the provided SqlTransaction.
  /// </summary>
  /// <remarks>
  /// e.g.: 
  ///  XmlReader r = ExecuteXmlReader(trans, CommandType.StoredProcedure, "GetOrders");
  /// </remarks>
  /// <param name="transaction">A valid SqlTransaction</param>
  /// <param name="commandType">The CommandType (stored procedure, text, etc.)</param>
  /// <param name="commandText">The stored procedure name or T-SQL command using "FOR XML AUTO"</param>
  /// <returns>An XmlReader containing the resultset generated by the command</returns>
  public static XmlReader ExecuteXmlReader(SqlTransaction transaction, CommandType commandType, string commandText)
  {
   // Pass through the call providing null for the set of SqlParameters
   return ExecuteXmlReader(transaction, commandType, commandText, (SqlParameter[])null);
  }

  /// <summary>
  /// Execute a SqlCommand (that returns a resultset) against the specified SqlTransaction
  /// using the provided parameters.
  /// </summary>
  /// <remarks>
  /// e.g.: 
  ///  XmlReader r = ExecuteXmlReader(trans, CommandType.StoredProcedure, "GetOrders", new SqlParameter("@prodid", 24));
  /// </remarks>
  /// <param name="transaction">A valid SqlTransaction</param>
  /// <param name="commandType">The CommandType (stored procedure, text, etc.)</param>
  /// <param name="commandText">The stored procedure name or T-SQL command using "FOR XML AUTO"</param>
  /// <param name="commandParameters">An array of SqlParamters used to execute the command</param>
  /// <returns>An XmlReader containing the resultset generated by the command</returns>
  public static XmlReader ExecuteXmlReader(SqlTransaction transaction, CommandType commandType, string commandText, params SqlParameter[] commandParameters)
  {
   if( transaction == null ) throw new ArgumentNullException( "transaction" );
   if( transaction != null && transaction.Connection == null ) throw new ArgumentException( "The transaction was rollbacked or commited, please provide an open transaction.", "transaction" );

   // Create a command and prepare it for execution
   SqlCommand cmd = new SqlCommand();
   bool mustCloseConnection = false;
   PrepareCommand(cmd, transaction.Connection, transaction, commandType, commandText, commandParameters, out mustCloseConnection );
   
   // Create the DataAdapter & DataSet
   XmlReader retval = cmd.ExecuteXmlReader();
   
   // Detach the SqlParameters from the command object, so they can be used again
   cmd.Parameters.Clear();
   return retval;   
  }

  /// <summary>
  /// Execute a stored procedure via a SqlCommand (that returns a resultset) against the specified
  /// SqlTransaction using the provided parameter values.  This method will query the database to discover the parameters for the
  /// stored procedure (the first time each stored procedure is called), and assign the values based on parameter order.
  /// </summary>
  /// <remarks>
  /// This method provides no access to output parameters or the stored procedure's return value parameter.
  ///
  /// e.g.: 
  ///  XmlReader r = ExecuteXmlReader(trans, "GetOrders", 24, 36);
  /// </remarks>
  /// <param name="transaction">A valid SqlTransaction</param>
  /// <param name="spName">The name of the stored procedure</param>
  /// <param name="parameterValues">An array of objects to be assigned as the input values of the stored procedure</param>
  /// <returns>A dataset containing the resultset generated by the command</returns>
  public static XmlReader ExecuteXmlReader(SqlTransaction transaction, string spName, params object[] parameterValues)
  {
   if( transaction == null ) throw new ArgumentNullException( "transaction" );
   if( transaction != null && transaction.Connection == null ) throw new ArgumentException( "The transaction was rollbacked or commited, please provide an open transaction.", "transaction" );
   if( spName == null || spName.Length == 0 ) throw new ArgumentNullException( "spName" );

   // If we receive parameter values, we need to figure out where they go
   if ((parameterValues != null) && (parameterValues.Length > 0))
   {
    // Pull the parameters for this stored procedure from the parameter cache (or discover them & populate the cache)
    SqlParameter[] commandParameters = SqlHelperParameterCache.GetSpParameterSet(transaction.Connection, spName);

    // Assign the provided values to these parameters based on parameter order
    AssignParameterValues(commandParameters, parameterValues);

    // Call the overload that takes an array of SqlParameters
    return ExecuteXmlReader(transaction, CommandType.StoredProcedure, spName, commandParameters);
   }
   else
   {
    // Otherwise we can just call the SP without params
    return ExecuteXmlReader(transaction, CommandType.StoredProcedure, spName);
   }
  }

  #endregion ExecuteXmlReader

  #region FillDataset
  /// <summary>
  /// Execute a SqlCommand (that returns a resultset and takes no parameters) against the database specified in
  /// the connection string.
  /// </summary>
  /// <remarks>
  /// e.g.: 
  ///  FillDataset(connString, CommandType.StoredProcedure, "GetOrders", ds, new string[] {"orders"});
  /// </remarks>
  /// <param name="connectionString">A valid connection string for a SqlConnection</param>
  /// <param name="commandType">The CommandType (stored procedure, text, etc.)</param>
  /// <param name="commandText">The stored procedure name or T-SQL command</param>
  /// <param name="dataSet">A dataset wich will contain the resultset generated by the command</param>
  /// <param name="tableNames">This array will be used to create table mappings allowing the DataTables to be referenced
  /// by a user defined name (probably the actual table name)</param>
  public static void FillDataset(string connectionString, CommandType commandType, string commandText, DataSet dataSet, string[] tableNames)
  {
   if( connectionString == null || connectionString.Length == 0 ) throw new ArgumentNullException( "connectionString" );
   if( dataSet == null ) throw new ArgumentNullException( "dataSet" );
           
   // Create & open a SqlConnection, and dispose of it after we are done
   using (SqlConnection connection = new SqlConnection(connectionString))
   {
    connection.Open();

    // Call the overload that takes a connection in place of the connection string
    FillDataset(connection, commandType, commandText, dataSet, tableNames);
   }
  }

  /// <summary>
  /// Execute a SqlCommand (that returns a resultset) against the database specified in the connection string
  /// using the provided parameters.
  /// </summary>
  /// <remarks>
  /// e.g.: 
  ///  FillDataset(connString, CommandType.StoredProcedure, "GetOrders", ds, new string[] {"orders"}, new SqlParameter("@prodid", 24));
  /// </remarks>
  /// <param name="connectionString">A valid connection string for a SqlConnection</param>
  /// <param name="commandType">The CommandType (stored procedure, text, etc.)</param>
  /// <param name="commandText">The stored procedure name or T-SQL command</param>
  /// <param name="commandParameters">An array of SqlParamters used to execute the command</param>
  /// <param name="dataSet">A dataset wich will contain the resultset generated by the command</param>
  /// <param name="tableNames">This array will be used to create table mappings allowing the DataTables to be referenced
  /// by a user defined name (probably the actual table name)
  /// </param>
  public static void FillDataset(string connectionString, CommandType commandType,
   string commandText, DataSet dataSet, string[] tableNames,
   params SqlParameter[] commandParameters)
  {
   if( connectionString == null || connectionString.Length == 0 ) throw new ArgumentNullException( "connectionString" );
   if( dataSet == null ) throw new ArgumentNullException( "dataSet" );
   // Create & open a SqlConnection, and dispose of it after we are done
   using (SqlConnection connection = new SqlConnection(connectionString))
   {
    connection.Open();

    // Call the overload that takes a connection in place of the connection string
    FillDataset(connection, commandType, commandText, dataSet, tableNames, commandParameters);
   }
  }

  /// <summary>
  /// Execute a stored procedure via a SqlCommand (that returns a resultset) against the database specified in
  /// the connection string using the provided parameter values.  This method will query the database to discover the parameters for the
  /// stored procedure (the first time each stored procedure is called), and assign the values based on parameter order.
  /// </summary>
  /// <remarks>
  /// This method provides no access to output parameters or the stored procedure's return value parameter.
  ///
  /// e.g.: 
  ///  FillDataset(connString, CommandType.StoredProcedure, "GetOrders", ds, new string[] {"orders"}, 24);
  /// </remarks>
  /// <param name="connectionString">A valid connection string for a SqlConnection</param>
  /// <param name="spName">The name of the stored procedure</param>
  /// <param name="dataSet">A dataset wich will contain the resultset generated by the command</param>
  /// <param name="tableNames">This array will be used to create table mappings allowing the DataTables to be referenced
  /// by a user defined name (probably the actual table name)
  /// </param>   
  /// <param name="parameterValues">An array of objects to be assigned as the input values of the stored procedure</param>
  public static void FillDataset(string connectionString, string spName,
   DataSet dataSet, string[] tableNames,
   params object[] parameterValues)
  {
   if( connectionString == null || connectionString.Length == 0 ) throw new ArgumentNullException( "connectionString" );
   if( dataSet == null ) throw new ArgumentNullException( "dataSet" );
   // Create & open a SqlConnection, and dispose of it after we are done
   using (SqlConnection connection = new SqlConnection(connectionString))
   {
    connection.Open();

    // Call the overload that takes a connection in place of the connection string
    FillDataset (connection, spName, dataSet, tableNames, parameterValues);
   }
  }

  /// <summary>
  /// Execute a SqlCommand (that returns a resultset and takes no parameters) against the provided SqlConnection.
  /// </summary>
  /// <remarks>
  /// e.g.: 
  ///  FillDataset(conn, CommandType.StoredProcedure, "GetOrders", ds, new string[] {"orders"});
  /// </remarks>
  /// <param name="connection">A valid SqlConnection</param>
  /// <param name="commandType">The CommandType (stored procedure, text, etc.)</param>
  /// <param name="commandText">The stored procedure name or T-SQL command</param>
  /// <param name="dataSet">A dataset wich will contain the resultset generated by the command</param>
  /// <param name="tableNames">This array will be used to create table mappings allowing the DataTables to be referenced
  /// by a user defined name (probably the actual table name)
  /// </param>   
  public static void FillDataset(SqlConnection connection, CommandType commandType,
   string commandText, DataSet dataSet, string[] tableNames)
  {
   FillDataset(connection, commandType, commandText, dataSet, tableNames, null);
  }

  /// <summary>
  /// Execute a SqlCommand (that returns a resultset) against the specified SqlConnection
  /// using the provided parameters.
  /// </summary>
  /// <remarks>
  /// e.g.: 
  ///  FillDataset(conn, CommandType.StoredProcedure, "GetOrders", ds, new string[] {"orders"}, new SqlParameter("@prodid", 24));
  /// </remarks>
  /// <param name="connection">A valid SqlConnection</param>
  /// <param name="commandType">The CommandType (stored procedure, text, etc.)</param>
  /// <param name="commandText">The stored procedure name or T-SQL command</param>
  /// <param name="dataSet">A dataset wich will contain the resultset generated by the command</param>
  /// <param name="tableNames">This array will be used to create table mappings allowing the DataTables to be referenced
  /// by a user defined name (probably the actual table name)
  /// </param>
  /// <param name="commandParameters">An array of SqlParamters used to execute the command</param>
  public static void FillDataset(SqlConnection connection, CommandType commandType,
   string commandText, DataSet dataSet, string[] tableNames,
   params SqlParameter[] commandParameters)
  {
   FillDataset(connection, null, commandType, commandText, dataSet, tableNames, commandParameters);
  }

  /// <summary>
  /// Execute a stored procedure via a SqlCommand (that returns a resultset) against the specified SqlConnection
  /// using the provided parameter values.  This method will query the database to discover the parameters for the
  /// stored procedure (the first time each stored procedure is called), and assign the values based on parameter order.
  /// </summary>
  /// <remarks>
  /// This method provides no access to output parameters or the stored procedure's return value parameter.
  ///
  /// e.g.: 
  ///  FillDataset(conn, "GetOrders", ds, new string[] {"orders"}, 24, 36);
  /// </remarks>
  /// <param name="connection">A valid SqlConnection</param>
  /// <param name="spName">The name of the stored procedure</param>
  /// <param name="dataSet">A dataset wich will contain the resultset generated by the command</param>
  /// <param name="tableNames">This array will be used to create table mappings allowing the DataTables to be referenced
  /// by a user defined name (probably the actual table name)
  /// </param>
  /// <param name="parameterValues">An array of objects to be assigned as the input values of the stored procedure</param>
  public static void FillDataset(SqlConnection connection, string spName,
   DataSet dataSet, string[] tableNames,
   params object[] parameterValues)
  {
   if ( connection == null ) throw new ArgumentNullException( "connection" );
   if (dataSet == null ) throw new ArgumentNullException( "dataSet" );
   if( spName == null || spName.Length == 0 ) throw new ArgumentNullException( "spName" );

   // If we receive parameter values, we need to figure out where they go
   if ((parameterValues != null) && (parameterValues.Length > 0))
   {
    // Pull the parameters for this stored procedure from the parameter cache (or discover them & populate the cache)
    SqlParameter[] commandParameters = SqlHelperParameterCache.GetSpParameterSet(connection, spName);

    // Assign the provided values to these parameters based on parameter order
    AssignParameterValues(commandParameters, parameterValues);

    // Call the overload that takes an array of SqlParameters
    FillDataset(connection, CommandType.StoredProcedure, spName, dataSet, tableNames, commandParameters);
   }
   else
   {
    // Otherwise we can just call the SP without params
    FillDataset(connection, CommandType.StoredProcedure, spName, dataSet, tableNames);
   }   
  }

  /// <summary>
  /// Execute a SqlCommand (that returns a resultset and takes no parameters) against the provided SqlTransaction.
  /// </summary>
  /// <remarks>
  /// e.g.: 
  ///  FillDataset(trans, CommandType.StoredProcedure, "GetOrders", ds, new string[] {"orders"});
  /// </remarks>
  /// <param name="transaction">A valid SqlTransaction</param>
  /// <param name="commandType">The CommandType (stored procedure, text, etc.)</param>
  /// <param name="commandText">The stored procedure name or T-SQL command</param>
  /// <param name="dataSet">A dataset wich will contain the resultset generated by the command</param>
  /// <param name="tableNames">This array will be used to create table mappings allowing the DataTables to be referenced
  /// by a user defined name (probably the actual table name)
  /// </param>
  public static void FillDataset(SqlTransaction transaction, CommandType commandType,
   string commandText,
   DataSet dataSet, string[] tableNames)
  {
   FillDataset (transaction, commandType, commandText, dataSet, tableNames, null);   
  }

  /// <summary>
  /// Execute a SqlCommand (that returns a resultset) against the specified SqlTransaction
  /// using the provided parameters.
  /// </summary>
  /// <remarks>
  /// e.g.: 
  ///  FillDataset(trans, CommandType.StoredProcedure, "GetOrders", ds, new string[] {"orders"}, new SqlParameter("@prodid", 24));
  /// </remarks>
  /// <param name="transaction">A valid SqlTransaction</param>
  /// <param name="commandType">The CommandType (stored procedure, text, etc.)</param>
  /// <param name="commandText">The stored procedure name or T-SQL command</param>
  /// <param name="dataSet">A dataset wich will contain the resultset generated by the command</param>
  /// <param name="tableNames">This array will be used to create table mappings allowing the DataTables to be referenced
  /// by a user defined name (probably the actual table name)
  /// </param>
  /// <param name="commandParameters">An array of SqlParamters used to execute the command</param>
  public static void FillDataset(SqlTransaction transaction, CommandType commandType,
   string commandText, DataSet dataSet, string[] tableNames,
   params SqlParameter[] commandParameters)
  {
   FillDataset(transaction.Connection, transaction, commandType, commandText, dataSet, tableNames, commandParameters);
  }

  /// <summary>
  /// Execute a stored procedure via a SqlCommand (that returns a resultset) against the specified
  /// SqlTransaction using the provided parameter values.  This method will query the database to discover the parameters for the
  /// stored procedure (the first time each stored procedure is called), and assign the values based on parameter order.
  /// </summary>
  /// <remarks>
  /// This method provides no access to output parameters or the stored procedure's return value parameter.
  ///
  /// e.g.: 
  ///  FillDataset(trans, "GetOrders", ds, new string[]{"orders"}, 24, 36);
  /// </remarks>
  /// <param name="transaction">A valid SqlTransaction</param>
  /// <param name="spName">The name of the stored procedure</param>
  /// <param name="dataSet">A dataset wich will contain the resultset generated by the command</param>
  /// <param name="tableNames">This array will be used to create table mappings allowing the DataTables to be referenced
  /// by a user defined name (probably the actual table name)
  /// </param>
  /// <param name="parameterValues">An array of objects to be assigned as the input values of the stored procedure</param>
  public static void FillDataset(SqlTransaction transaction, string spName,
   DataSet dataSet, string[] tableNames,
   params object[] parameterValues)
  {
   if( transaction == null ) throw new ArgumentNullException( "transaction" );
   if( transaction != null && transaction.Connection == null ) throw new ArgumentException( "The transaction was rollbacked or commited, please provide an open transaction.", "transaction" );
   if( dataSet == null ) throw new ArgumentNullException( "dataSet" );
   if( spName == null || spName.Length == 0 ) throw new ArgumentNullException( "spName" );

   // If we receive parameter values, we need to figure out where they go
   if ((parameterValues != null) && (parameterValues.Length > 0))
   {
    // Pull the parameters for this stored procedure from the parameter cache (or discover them & populate the cache)
    SqlParameter[] commandParameters = SqlHelperParameterCache.GetSpParameterSet(transaction.Connection, spName);

    // Assign the provided values to these parameters based on parameter order
    AssignParameterValues(commandParameters, parameterValues);

    // Call the overload that takes an array of SqlParameters
    FillDataset(transaction, CommandType.StoredProcedure, spName, dataSet, tableNames, commandParameters);
   }
   else
   {
    // Otherwise we can just call the SP without params
    FillDataset(transaction, CommandType.StoredProcedure, spName, dataSet, tableNames);
   }   
  }

  /// <summary>
  /// Private helper method that execute a SqlCommand (that returns a resultset) against the specified SqlTransaction and SqlConnection
  /// using the provided parameters.
  /// </summary>
  /// <remarks>
  /// e.g.: 
  ///  FillDataset(conn, trans, CommandType.StoredProcedure, "GetOrders", ds, new string[] {"orders"}, new SqlParameter("@prodid", 24));
  /// </remarks>
  /// <param name="connection">A valid SqlConnection</param>
  /// <param name="transaction">A valid SqlTransaction</param>
  /// <param name="commandType">The CommandType (stored procedure, text, etc.)</param>
  /// <param name="commandText">The stored procedure name or T-SQL command</param>
  /// <param name="dataSet">A dataset wich will contain the resultset generated by the command</param>
  /// <param name="tableNames">This array will be used to create table mappings allowing the DataTables to be referenced
  /// by a user defined name (probably the actual table name)
  /// </param>
  /// <param name="commandParameters">An array of SqlParamters used to execute the command</param>
  private static void FillDataset(SqlConnection connection, SqlTransaction transaction, CommandType commandType,
   string commandText, DataSet dataSet, string[] tableNames,
   params SqlParameter[] commandParameters)
  {
   if( connection == null ) throw new ArgumentNullException( "connection" );
   if( dataSet == null ) throw new ArgumentNullException( "dataSet" );

   // Create a command and prepare it for execution
   SqlCommand command = new SqlCommand();
   bool mustCloseConnection = false;
   PrepareCommand(command, connection, transaction, commandType, commandText, commandParameters, out mustCloseConnection );
       
   // Create the DataAdapter & DataSet
   using( SqlDataAdapter dataAdapter = new SqlDataAdapter(command) )
   {
               
    // Add the table mappings specified by the user
    if (tableNames != null && tableNames.Length > 0)
    {
     string tableName = "Table";
     for (int index=0; index < tableNames.Length; index++)
     {
      if( tableNames[index] == null || tableNames[index].Length == 0 ) throw new ArgumentException( "The tableNames parameter must contain a list of tables, a value was provided as null or empty string.", "tableNames" );
      dataAdapter.TableMappings.Add(tableName, tableNames[index]);
      tableName += (index + 1).ToString();
     }
    }
               
    // Fill the DataSet using default values for DataTable names, etc
    dataAdapter.Fill(dataSet);

    // Detach the SqlParameters from the command object, so they can be used again
    command.Parameters.Clear();
   }

   if( mustCloseConnection )
    connection.Close();
  }
  #endregion
       
  #region UpdateDataset
  /// <summary>
  /// Executes the respective command for each inserted, updated, or deleted row in the DataSet.
  /// </summary>
  /// <remarks>
  /// e.g.: 
  ///  UpdateDataset(conn, insertCommand, deleteCommand, updateCommand, dataSet, "Order");
  /// </remarks>
  /// <param name="insertCommand">A valid transact-SQL statement or stored procedure to insert new records into the data source</param>
  /// <param name="deleteCommand">A valid transact-SQL statement or stored procedure to delete records from the data source</param>
  /// <param name="updateCommand">A valid transact-SQL statement or stored procedure used to update records in the data source</param>
  /// <param name="dataSet">The DataSet used to update the data source</param>
  /// <param name="tableName">The DataTable used to update the data source.</param>
  public static void UpdateDataset(SqlCommand insertCommand, SqlCommand deleteCommand, SqlCommand updateCommand, DataSet dataSet, string tableName)
  {
   if( insertCommand == null ) throw new ArgumentNullException( "insertCommand" );
   if( deleteCommand == null ) throw new ArgumentNullException( "deleteCommand" );
   if( updateCommand == null ) throw new ArgumentNullException( "updateCommand" );
   if( tableName == null || tableName.Length == 0 ) throw new ArgumentNullException( "tableName" );

   // Create a SqlDataAdapter, and dispose of it after we are done
   using (SqlDataAdapter dataAdapter = new SqlDataAdapter())
   {
    // Set the data adapter commands
    dataAdapter.UpdateCommand = updateCommand;
    dataAdapter.InsertCommand = insertCommand;
    dataAdapter.DeleteCommand = deleteCommand;

    // Update the dataset changes in the data source
    dataAdapter.Update (dataSet, tableName);

    // Commit all the changes made to the DataSet
    dataSet.AcceptChanges();
   }
  }
  #endregion

  #region CreateCommand
  /// <summary>
  /// Simplify the creation of a Sql command object by allowing
  /// a stored procedure and optional parameters to be provided
  /// </summary>
  /// <remarks>
  /// e.g.: 
  ///  SqlCommand command = CreateCommand(conn, "AddCustomer", "CustomerID", "CustomerName");
  /// </remarks>
  /// <param name="connection">A valid SqlConnection object</param>
  /// <param name="spName">The name of the stored procedure</param>
  /// <param name="sourceColumns">An array of string to be assigned as the source columns of the stored procedure parameters</param>
  /// <returns>A valid SqlCommand object</returns>
  public static SqlCommand CreateCommand(SqlConnection connection, string spName, params string[] sourceColumns)
  {
   if( connection == null ) throw new ArgumentNullException( "connection" );
   if( spName == null || spName.Length == 0 ) throw new ArgumentNullException( "spName" );

   // Create a SqlCommand
   SqlCommand cmd = new SqlCommand( spName, connection );
   cmd.CommandType = CommandType.StoredProcedure;

   // If we receive parameter values, we need to figure out where they go
   if ((sourceColumns != null) && (sourceColumns.Length > 0))
   {
    // Pull the parameters for this stored procedure from the parameter cache (or discover them & populate the cache)
    SqlParameter[] commandParameters = SqlHelperParameterCache.GetSpParameterSet(connection, spName);

    // Assign the provided source columns to these parameters based on parameter order
    for (int index=0; index < sourceColumns.Length; index++)
     commandParameters[index].SourceColumn = sourceColumns[index];

    // Attach the discovered parameters to the SqlCommand object
    AttachParameters (cmd, commandParameters);
   }

   return cmd;
  }
  #endregion

  #region ExecuteNonQueryTypedParams
  /// <summary>
  /// Execute a stored procedure via a SqlCommand (that returns no resultset) against the database specified in
  /// the connection string using the dataRow column values as the stored procedure's parameters values.
  /// This method will query the database to discover the parameters for the
  /// stored procedure (the first time each stored procedure is called), and assign the values based on row values.
  /// </summary>
  /// <param name="connectionString">A valid connection string for a SqlConnection</param>
  /// <param name="spName">The name of the stored procedure</param>
  /// <param name="dataRow">The dataRow used to hold the stored procedure's parameter values.</param>
  /// <returns>An int representing the number of rows affected by the command</returns>
  public static int ExecuteNonQueryTypedParams(String connectionString, String spName, DataRow dataRow)
  {
   if( connectionString == null || connectionString.Length == 0 ) throw new ArgumentNullException( "connectionString" );
   if( spName == null || spName.Length == 0 ) throw new ArgumentNullException( "spName" );
   
   // If the row has values, the store procedure parameters must be initialized
   if (dataRow != null && dataRow.ItemArray.Length > 0)
   {
    // Pull the parameters for this stored procedure from the parameter cache (or discover them & populate the cache)
    SqlParameter[] commandParameters = SqlHelperParameterCache.GetSpParameterSet(connectionString, spName);
               
    // Set the parameters values
    AssignParameterValues(commandParameters, dataRow);
                               
    return SqlHelper.ExecuteNonQuery(connectionString, CommandType.StoredProcedure, spName, commandParameters);
   }
   else
   {
    return SqlHelper.ExecuteNonQuery(connectionString, CommandType.StoredProcedure, spName);
   }
  }

  /// <summary>
  /// Execute a stored procedure via a SqlCommand (that returns no resultset) against the specified SqlConnection
  /// using the dataRow column values as the stored procedure's parameters values. 
  /// This method will query the database to discover the parameters for the
  /// stored procedure (the first time each stored procedure is called), and assign the values based on row values.
  /// </summary>
  /// <param name="connection">A valid SqlConnection object</param>
  /// <param name="spName">The name of the stored procedure</param>
  /// <param name="dataRow">The dataRow used to hold the stored procedure's parameter values.</param>
  /// <returns>An int representing the number of rows affected by the command</returns>
  public static int ExecuteNonQueryTypedParams(SqlConnection connection, String spName, DataRow dataRow)
  {
   if( connection == null ) throw new ArgumentNullException( "connection" );
   if( spName == null || spName.Length == 0 ) throw new ArgumentNullException( "spName" );

   // If the row has values, the store procedure parameters must be initialized
   if (dataRow != null && dataRow.ItemArray.Length > 0)
   {
    // Pull the parameters for this stored procedure from the parameter cache (or discover them & populate the cache)
    SqlParameter[] commandParameters = SqlHelperParameterCache.GetSpParameterSet(connection, spName);
               
    // Set the parameters values
    AssignParameterValues(commandParameters, dataRow);
                               
    return SqlHelper.ExecuteNonQuery(connection, CommandType.StoredProcedure, spName, commandParameters);
   }
   else
   {
    return SqlHelper.ExecuteNonQuery(connection, CommandType.StoredProcedure, spName);
   }
  }

  /// <summary>
  /// Execute a stored procedure via a SqlCommand (that returns no resultset) against the specified
  /// SqlTransaction using the dataRow column values as the stored procedure's parameters values.
  /// This method will query the database to discover the parameters for the
  /// stored procedure (the first time each stored procedure is called), and assign the values based on row values.
  /// </summary>
  /// <param name="transaction">A valid SqlTransaction object</param>
  /// <param name="spName">The name of the stored procedure</param>
  /// <param name="dataRow">The dataRow used to hold the stored procedure's parameter values.</param>
  /// <returns>An int representing the number of rows affected by the command</returns>
  public static int ExecuteNonQueryTypedParams(SqlTransaction transaction, String spName, DataRow dataRow)
  {
   if( transaction == null ) throw new ArgumentNullException( "transaction" );
   if( transaction != null && transaction.Connection == null ) throw new ArgumentException( "The transaction was rollbacked or commited, please provide an open transaction.", "transaction" );
   if( spName == null || spName.Length == 0 ) throw new ArgumentNullException( "spName" );

   // Sf the row has values, the store procedure parameters must be initialized
   if (dataRow != null && dataRow.ItemArray.Length > 0)
   {
    // Pull the parameters for this stored procedure from the parameter cache (or discover them & populate the cache)
    SqlParameter[] commandParameters = SqlHelperParameterCache.GetSpParameterSet(transaction.Connection, spName);
               
    // Set the parameters values
    AssignParameterValues(commandParameters, dataRow);
                               
    return SqlHelper.ExecuteNonQuery(transaction, CommandType.StoredProcedure, spName, commandParameters);
   }
   else
   {
    return SqlHelper.ExecuteNonQuery(transaction, CommandType.StoredProcedure, spName);
   }
  }
  #endregion

  #region ExecuteDatasetTypedParams
  /// <summary>
  /// Execute a stored procedure via a SqlCommand (that returns a resultset) against the database specified in
  /// the connection string using the dataRow column values as the stored procedure's parameters values.
  /// This method will query the database to discover the parameters for the
  /// stored procedure (the first time each stored procedure is called), and assign the values based on row values.
  /// </summary>
  /// <param name="connectionString">A valid connection string for a SqlConnection</param>
  /// <param name="spName">The name of the stored procedure</param>
  /// <param name="dataRow">The dataRow used to hold the stored procedure's parameter values.</param>
  /// <returns>A dataset containing the resultset generated by the command</returns>
  public static DataSet ExecuteDatasetTypedParams(string connectionString, String spName, DataRow dataRow)
  {
   if( connectionString == null || connectionString.Length == 0 ) throw new ArgumentNullException( "connectionString" );
   if( spName == null || spName.Length == 0 ) throw new ArgumentNullException( "spName" );

   //If the row has values, the store procedure parameters must be initialized
   if ( dataRow != null && dataRow.ItemArray.Length > 0)
   {
    // Pull the parameters for this stored procedure from the parameter cache (or discover them & populate the cache)
    SqlParameter[] commandParameters = SqlHelperParameterCache.GetSpParameterSet(connectionString, spName);
               
    // Set the parameters values
    AssignParameterValues(commandParameters, dataRow);
               
    return SqlHelper.ExecuteDataset(connectionString, CommandType.StoredProcedure, spName, commandParameters);
   }
   else
   {
    return SqlHelper.ExecuteDataset(connectionString, CommandType.StoredProcedure, spName);
   }
  }

  /// <summary>
  /// Execute a stored procedure via a SqlCommand (that returns a resultset) against the specified SqlConnection
  /// using the dataRow column values as the store procedure's parameters values.
  /// This method will query the database to discover the parameters for the
  /// stored procedure (the first time each stored procedure is called), and assign the values based on row values.
  /// </summary>
  /// <param name="connection">A valid SqlConnection object</param>
  /// <param name="spName">The name of the stored procedure</param>
  /// <param name="dataRow">The dataRow used to hold the stored procedure's parameter values.</param>
  /// <returns>A dataset containing the resultset generated by the command</returns>
  public static DataSet ExecuteDatasetTypedParams(SqlConnection connection, String spName, DataRow dataRow)
  {
   if( connection == null ) throw new ArgumentNullException( "connection" );
   if( spName == null || spName.Length == 0 ) throw new ArgumentNullException( "spName" );

   // If the row has values, the store procedure parameters must be initialized
   if( dataRow != null && dataRow.ItemArray.Length > 0)
   {
    // Pull the parameters for this stored procedure from the parameter cache (or discover them & populate the cache)
    SqlParameter[] commandParameters = SqlHelperParameterCache.GetSpParameterSet(connection, spName);
               
    // Set the parameters values
    AssignParameterValues(commandParameters, dataRow);
               
    return SqlHelper.ExecuteDataset(connection, CommandType.StoredProcedure, spName, commandParameters);
   }
   else
   {
    return SqlHelper.ExecuteDataset(connection, CommandType.StoredProcedure, spName);
   }
  }

  /// <summary>
  /// Execute a stored procedure via a SqlCommand (that returns a resultset) against the specified SqlTransaction
  /// using the dataRow column values as the stored procedure's parameters values.
  /// This method will query the database to discover the parameters for the
  /// stored procedure (the first time each stored procedure is called), and assign the values based on row values.
  /// </summary>
  /// <param name="transaction">A valid SqlTransaction object</param>
  /// <param name="spName">The name of the stored procedure</param>
  /// <param name="dataRow">The dataRow used to hold the stored procedure's parameter values.</param>
  /// <returns>A dataset containing the resultset generated by the command</returns>
  public static DataSet ExecuteDatasetTypedParams(SqlTransaction transaction, String spName, DataRow dataRow)
  {
   if( transaction == null ) throw new ArgumentNullException( "transaction" );
   if( transaction != null && transaction.Connection == null ) throw new ArgumentException( "The transaction was rollbacked or commited, please provide an open transaction.", "transaction" );
   if( spName == null || spName.Length == 0 ) throw new ArgumentNullException( "spName" );

   // If the row has values, the store procedure parameters must be initialized
   if( dataRow != null && dataRow.ItemArray.Length > 0)
   {
    // Pull the parameters for this stored procedure from the parameter cache (or discover them & populate the cache)
    SqlParameter[] commandParameters = SqlHelperParameterCache.GetSpParameterSet(transaction.Connection, spName);
               
    // Set the parameters values
    AssignParameterValues(commandParameters, dataRow);
               
    return SqlHelper.ExecuteDataset(transaction, CommandType.StoredProcedure, spName, commandParameters);
   }
   else
   {
    return SqlHelper.ExecuteDataset(transaction, CommandType.StoredProcedure, spName);
   }
  }

  #endregion

  #region ExecuteReaderTypedParams
  /// <summary>
  /// Execute a stored procedure via a SqlCommand (that returns a resultset) against the database specified in
  /// the connection string using the dataRow column values as the stored procedure's parameters values.
  /// This method will query the database to discover the parameters for the
  /// stored procedure (the first time each stored procedure is called), and assign the values based on parameter order.
  /// </summary>
  /// <param name="connectionString">A valid connection string for a SqlConnection</param>
  /// <param name="spName">The name of the stored procedure</param>
  /// <param name="dataRow">The dataRow used to hold the stored procedure's parameter values.</param>
  /// <returns>A SqlDataReader containing the resultset generated by the command</returns>
  public static SqlDataReader ExecuteReaderTypedParams(String connectionString, String spName, DataRow dataRow)
  {
   if( connectionString == null || connectionString.Length == 0 ) throw new ArgumentNullException( "connectionString" );
   if( spName == null || spName.Length == 0 ) throw new ArgumentNullException( "spName" );
   
   // If the row has values, the store procedure parameters must be initialized
   if ( dataRow != null && dataRow.ItemArray.Length > 0 )
   {
    // Pull the parameters for this stored procedure from the parameter cache (or discover them & populate the cache)
    SqlParameter[] commandParameters = SqlHelperParameterCache.GetSpParameterSet(connectionString, spName);
               
    // Set the parameters values
    AssignParameterValues(commandParameters, dataRow);
               
    return SqlHelper.ExecuteReader(connectionString, CommandType.StoredProcedure, spName, commandParameters);
   }
   else
   {
    return SqlHelper.ExecuteReader(connectionString, CommandType.StoredProcedure, spName);
   }
  }

               
  /// <summary>
  /// Execute a stored procedure via a SqlCommand (that returns a resultset) against the specified SqlConnection
  /// using the dataRow column values as the stored procedure's parameters values.
  /// This method will query the database to discover the parameters for the
  /// stored procedure (the first time each stored procedure is called), and assign the values based on parameter order.
  /// </summary>
  /// <param name="connection">A valid SqlConnection object</param>
  /// <param name="spName">The name of the stored procedure</param>
  /// <param name="dataRow">The dataRow used to hold the stored procedure's parameter values.</param>
  /// <returns>A SqlDataReader containing the resultset generated by the command</returns>
  public static SqlDataReader ExecuteReaderTypedParams(SqlConnection connection, String spName, DataRow dataRow)
  {
   if( connection == null ) throw new ArgumentNullException( "connection" );
   if( spName == null || spName.Length == 0 ) throw new ArgumentNullException( "spName" );

   // If the row has values, the store procedure parameters must be initialized
   if( dataRow != null && dataRow.ItemArray.Length > 0)
   {
    // Pull the parameters for this stored procedure from the parameter cache (or discover them & populate the cache)
    SqlParameter[] commandParameters = SqlHelperParameterCache.GetSpParameterSet(connection, spName);
               
    // Set the parameters values
    AssignParameterValues(commandParameters, dataRow);
               
    return SqlHelper.ExecuteReader(connection, CommandType.StoredProcedure, spName, commandParameters);
   }
   else
   {
    return SqlHelper.ExecuteReader(connection, CommandType.StoredProcedure, spName);
   }
  }
       
  /// <summary>
  /// Execute a stored procedure via a SqlCommand (that returns a resultset) against the specified SqlTransaction
  /// using the dataRow column values as the stored procedure's parameters values.
  /// This method will query the database to discover the parameters for the
  /// stored procedure (the first time each stored procedure is called), and assign the values based on parameter order.
  /// </summary>
  /// <param name="transaction">A valid SqlTransaction object</param>
  /// <param name="spName">The name of the stored procedure</param>
  /// <param name="dataRow">The dataRow used to hold the stored procedure's parameter values.</param>
  /// <returns>A SqlDataReader containing the resultset generated by the command</returns>
  public static SqlDataReader ExecuteReaderTypedParams(SqlTransaction transaction, String spName, DataRow dataRow)
  {
   if( transaction == null ) throw new ArgumentNullException( "transaction" );
   if( transaction != null && transaction.Connection == null ) throw new ArgumentException( "The transaction was rollbacked or commited, please provide an open transaction.", "transaction" );
   if( spName == null || spName.Length == 0 ) throw new ArgumentNullException( "spName" );

   // If the row has values, the store procedure parameters must be initialized
   if( dataRow != null && dataRow.ItemArray.Length > 0 )
   {
    // Pull the parameters for this stored procedure from the parameter cache (or discover them & populate the cache)
    SqlParameter[] commandParameters = SqlHelperParameterCache.GetSpParameterSet(transaction.Connection, spName);
               
    // Set the parameters values
    AssignParameterValues(commandParameters, dataRow);
               
    return SqlHelper.ExecuteReader(transaction, CommandType.StoredProcedure, spName, commandParameters);
   }
   else
   {
    return SqlHelper.ExecuteReader(transaction, CommandType.StoredProcedure, spName);
   }
  }
  #endregion

  #region ExecuteScalarTypedParams
  /// <summary>
  /// Execute a stored procedure via a SqlCommand (that returns a 1x1 resultset) against the database specified in
  /// the connection string using the dataRow column values as the stored procedure's parameters values.
  /// This method will query the database to discover the parameters for the
  /// stored procedure (the first time each stored procedure is called), and assign the values based on parameter order.
  /// </summary>
  /// <param name="connectionString">A valid connection string for a SqlConnection</param>
  /// <param name="spName">The name of the stored procedure</param>
  /// <param name="dataRow">The dataRow used to hold the stored procedure's parameter values.</param>
  /// <returns>An object containing the value in the 1x1 resultset generated by the command</returns>
  public static object ExecuteScalarTypedParams(String connectionString, String spName, DataRow dataRow)
  {
   if( connectionString == null || connectionString.Length == 0 ) throw new ArgumentNullException( "connectionString" );
   if( spName == null || spName.Length == 0 ) throw new ArgumentNullException( "spName" );
   
   // If the row has values, the store procedure parameters must be initialized
   if( dataRow != null && dataRow.ItemArray.Length > 0)
   {
    // Pull the parameters for this stored procedure from the parameter cache (or discover them & populate the cache)
    SqlParameter[] commandParameters = SqlHelperParameterCache.GetSpParameterSet(connectionString, spName);
               
    // Set the parameters values
    AssignParameterValues(commandParameters, dataRow);
               
    return SqlHelper.ExecuteScalar(connectionString, CommandType.StoredProcedure, spName, commandParameters);
   }
   else
   {
    return SqlHelper.ExecuteScalar(connectionString, CommandType.StoredProcedure, spName);
   }
  }

  /// <summary>
  /// Execute a stored procedure via a SqlCommand (that returns a 1x1 resultset) against the specified SqlConnection
  /// using the dataRow column values as the stored procedure's parameters values.
  /// This method will query the database to discover the parameters for the
  /// stored procedure (the first time each stored procedure is called), and assign the values based on parameter order.
  /// </summary>
  /// <param name="connection">A valid SqlConnection object</param>
  /// <param name="spName">The name of the stored procedure</param>
  /// <param name="dataRow">The dataRow used to hold the stored procedure's parameter values.</param>
  /// <returns>An object containing the value in the 1x1 resultset generated by the command</returns>
  public static object ExecuteScalarTypedParams(SqlConnection connection, String spName, DataRow dataRow)
  {
   if( connection == null ) throw new ArgumentNullException( "connection" );
   if( spName == null || spName.Length == 0 ) throw new ArgumentNullException( "spName" );

   // If the row has values, the store procedure parameters must be initialized
   if( dataRow != null && dataRow.ItemArray.Length > 0)
   {
    // Pull the parameters for this stored procedure from the parameter cache (or discover them & populate the cache)
    SqlParameter[] commandParameters = SqlHelperParameterCache.GetSpParameterSet(connection, spName);
               
    // Set the parameters values
    AssignParameterValues(commandParameters, dataRow);
               
    return SqlHelper.ExecuteScalar(connection, CommandType.StoredProcedure, spName, commandParameters);
   }
   else
   {
    return SqlHelper.ExecuteScalar(connection, CommandType.StoredProcedure, spName);
   }
  }

  /// <summary>
  /// Execute a stored procedure via a SqlCommand (that returns a 1x1 resultset) against the specified SqlTransaction
  /// using the dataRow column values as the stored procedure's parameters values.
  /// This method will query the database to discover the parameters for the
  /// stored procedure (the first time each stored procedure is called), and assign the values based on parameter order.
  /// </summary>
  /// <param name="transaction">A valid SqlTransaction object</param>
  /// <param name="spName">The name of the stored procedure</param>
  /// <param name="dataRow">The dataRow used to hold the stored procedure's parameter values.</param>
  /// <returns>An object containing the value in the 1x1 resultset generated by the command</returns>
  public static object ExecuteScalarTypedParams(SqlTransaction transaction, String spName, DataRow dataRow)
  {
   if( transaction == null ) throw new ArgumentNullException( "transaction" );
   if( transaction != null && transaction.Connection == null ) throw new ArgumentException( "The transaction was rollbacked or commited, please provide an open transaction.", "transaction" );
   if( spName == null || spName.Length == 0 ) throw new ArgumentNullException( "spName" );

   // If the row has values, the store procedure parameters must be initialized
   if( dataRow != null && dataRow.ItemArray.Length > 0)
   {
    // Pull the parameters for this stored procedure from the parameter cache (or discover them & populate the cache)
    SqlParameter[] commandParameters = SqlHelperParameterCache.GetSpParameterSet(transaction.Connection, spName);
               
    // Set the parameters values
    AssignParameterValues(commandParameters, dataRow);
               
    return SqlHelper.ExecuteScalar(transaction, CommandType.StoredProcedure, spName, commandParameters);
   }
   else
   {
    return SqlHelper.ExecuteScalar(transaction, CommandType.StoredProcedure, spName);
   }
  }
  #endregion

  #region ExecuteXmlReaderTypedParams
  /// <summary>
  /// Execute a stored procedure via a SqlCommand (that returns a resultset) against the specified SqlConnection
  /// using the dataRow column values as the stored procedure's parameters values.
  /// This method will query the database to discover the parameters for the
  /// stored procedure (the first time each stored procedure is called), and assign the values based on parameter order.
  /// </summary>
  /// <param name="connection">A valid SqlConnection object</param>
  /// <param name="spName">The name of the stored procedure</param>
  /// <param name="dataRow">The dataRow used to hold the stored procedure's parameter values.</param>
  /// <returns>An XmlReader containing the resultset generated by the command</returns>
  public static XmlReader ExecuteXmlReaderTypedParams(SqlConnection connection, String spName, DataRow dataRow)
  {
   if( connection == null ) throw new ArgumentNullException( "connection" );
   if( spName == null || spName.Length == 0 ) throw new ArgumentNullException( "spName" );

   // If the row has values, the store procedure parameters must be initialized
   if( dataRow != null && dataRow.ItemArray.Length > 0)
   {
    // Pull the parameters for this stored procedure from the parameter cache (or discover them & populate the cache)
    SqlParameter[] commandParameters = SqlHelperParameterCache.GetSpParameterSet(connection, spName);
               
    // Set the parameters values
    AssignParameterValues(commandParameters, dataRow);
               
    return SqlHelper.ExecuteXmlReader(connection, CommandType.StoredProcedure, spName, commandParameters);
   }
   else
   {
    return SqlHelper.ExecuteXmlReader(connection, CommandType.StoredProcedure, spName);
   }
  }

  /// <summary>
  /// Execute a stored procedure via a SqlCommand (that returns a resultset) against the specified SqlTransaction
  /// using the dataRow column values as the stored procedure's parameters values.
  /// This method will query the database to discover the parameters for the
  /// stored procedure (the first time each stored procedure is called), and assign the values based on parameter order.
  /// </summary>
  /// <param name="transaction">A valid SqlTransaction object</param>
  /// <param name="spName">The name of the stored procedure</param>
  /// <param name="dataRow">The dataRow used to hold the stored procedure's parameter values.</param>
  /// <returns>An XmlReader containing the resultset generated by the command</returns>
  public static XmlReader ExecuteXmlReaderTypedParams(SqlTransaction transaction, String spName, DataRow dataRow)
  {
   if( transaction == null ) throw new ArgumentNullException( "transaction" );
   if( transaction != null && transaction.Connection == null ) throw new ArgumentException( "The transaction was rollbacked or commited, please provide an open transaction.", "transaction" );
   if( spName == null || spName.Length == 0 ) throw new ArgumentNullException( "spName" );

   // If the row has values, the store procedure parameters must be initialized
   if( dataRow != null && dataRow.ItemArray.Length > 0)
   {
    // Pull the parameters for this stored procedure from the parameter cache (or discover them & populate the cache)
    SqlParameter[] commandParameters = SqlHelperParameterCache.GetSpParameterSet(transaction.Connection, spName);
               
    // Set the parameters values
    AssignParameterValues(commandParameters, dataRow);
               
    return SqlHelper.ExecuteXmlReader(transaction, CommandType.StoredProcedure, spName, commandParameters);
   }
   else
   {
    return SqlHelper.ExecuteXmlReader(transaction, CommandType.StoredProcedure, spName);
   }
  }
  #endregion

  /// <summary>
  /// add parameter array to the cache
  /// </summary>
  /// <param name="cacheKey">Key to the parameter cache</param>
  /// <param name="cmdParms">an array of SqlParamters to be cached</param>
  public static void CacheParameters(string cacheKey, params SqlParameter[] cmdParms)
  {
   parmCache[cacheKey] = cmdParms;
  }

  /// <summary>
  /// Retrieve cached parameters
  /// </summary>
  /// <param name="cacheKey">key used to lookup parameters</param>
  /// <returns>Cached SqlParamters array</returns>
  public static SqlParameter[] GetCachedParameters(string cacheKey)
  {
   SqlParameter[] cachedParms = (SqlParameter[])parmCache[cacheKey];
   
   if (cachedParms == null)
    return null;
   
   SqlParameter[] clonedParms = new SqlParameter[cachedParms.Length];

   for (int i = 0, j = cachedParms.Length; i < j; i++)
    clonedParms[i] = (SqlParameter)((ICloneable)cachedParms[i]).Clone();

   return clonedParms;
  }

  /// <summary>
  /// Fills a typed DataSet using the DataReader's current result. This method
  /// allows paginated access to the database.
  /// </summary>
  /// <param name="dataReader">The DataReader used to fetch the values.</param>
  /// <param name="dataSet">The DataSet used to store the values.</param>
  /// <param name="tableName">The name of the DataSet table used to add the
  /// DataReader records.</param>
  /// <param name="from">The quantity of records skipped before placing
  /// values on the DataReader on the DataSet.</param>
  /// <param name="count">The maximum quantity of records alloed to fill on the
  /// DataSet.</param>
  public static void Fill( IDataReader dataReader, DataSet dataSet, string tableName, int from, int count )
  {
   if( tableName == null)
    tableName = "unknownTable";
      
   if( dataSet.Tables[ tableName ] == null  )
    dataSet.Tables.Add( tableName );
   
   // Get the DataTable reference
   DataTable fillTable;
   if( tableName == null )
    fillTable = dataSet.Tables[ 0 ];
   else
    fillTable = dataSet.Tables[ tableName ];

   DataRow fillRow;
   string fieldName;
   int recNumber = 0;
   int totalRecords = from + count;
   while( dataReader.Read() )
   {
    if( recNumber++ >= from )
    {
     fillRow = fillTable.NewRow();
     for( int fieldIdx = 0; fieldIdx < dataReader.FieldCount; fieldIdx++ )
     {
      fieldName = dataReader.GetName( fieldIdx );
      if( fillTable.Columns.IndexOf( fieldName ) == -1 )
       fillTable.Columns.Add( fieldName, dataReader.GetValue( fieldIdx ).GetType() );
      fillRow[ fieldName ] = dataReader.GetValue( fieldIdx );
     }
     fillTable.Rows.Add( fillRow );
    }
    if( count != 0 && totalRecords <= recNumber )
     break;
   }
   dataSet.AcceptChanges();
  }
 }

 /// <summary>
 /// SqlHelperParameterCache provides functions to leverage a static cache of procedure parameters, and the
 /// ability to discover parameters for stored procedures at run-time.
 /// </summary>
 public sealed class SqlHelperParameterCache
 {
  #region private methods, variables, and constructors

  //Since this class provides only static methods, make the default constructor private to prevent
  //instances from being created with "new SqlHelperParameterCache()"
  private SqlHelperParameterCache() {}

  private static Hashtable paramCache = Hashtable.Synchronized(new Hashtable());

  /// <summary>
  /// Resolve at run time the appropriate set of SqlParameters for a stored procedure
  /// </summary>
  /// <param name="connection">A valid SqlConnection object</param>
  /// <param name="spName">The name of the stored procedure</param>
  /// <param name="includeReturnValueParameter">Whether or not to include their return value parameter</param>
  /// <returns>The parameter array discovered.</returns>
  private static SqlParameter[] DiscoverSpParameterSet(SqlConnection connection, string spName, bool includeReturnValueParameter)
  {
   if( connection == null ) throw new ArgumentNullException( "connection" );
   if( spName == null || spName.Length == 0 ) throw new ArgumentNullException( "spName" );

   SqlCommand cmd = new SqlCommand(spName, connection);
   cmd.CommandType = CommandType.StoredProcedure;

   connection.Open();
   SqlCommandBuilder.DeriveParameters(cmd);
   connection.Close();

   if (!includeReturnValueParameter)
   {
    cmd.Parameters.RemoveAt(0);
   }
               
   SqlParameter[] discoveredParameters = new SqlParameter[cmd.Parameters.Count];

   cmd.Parameters.CopyTo(discoveredParameters, 0);

   // Init the parameters with a DBNull value
   foreach (SqlParameter discoveredParameter in discoveredParameters)
   {
    discoveredParameter.Value = DBNull.Value;
   }
   return discoveredParameters;
  }

  /// <summary>
  /// Deep copy of cached SqlParameter array
  /// </summary>
  /// <param name="originalParameters"></param>
  /// <returns></returns>
  private static SqlParameter[] CloneParameters(SqlParameter[] originalParameters)
  {
   SqlParameter[] clonedParameters = new SqlParameter[originalParameters.Length];

   for (int i = 0, j = originalParameters.Length; i < j; i++)
   {
    clonedParameters[i] = (SqlParameter)((ICloneable)originalParameters[i]).Clone();
   }

   return clonedParameters;
  }

  #endregion private methods, variables, and constructors

  #region caching functions

  /// <summary>
  /// Add parameter array to the cache
  /// </summary>
  /// <param name="connectionString">A valid connection string for a SqlConnection</param>
  /// <param name="commandText">The stored procedure name or T-SQL command</param>
  /// <param name="commandParameters">An array of SqlParamters to be cached</param>
  public static void CacheParameterSet(string connectionString, string commandText, params SqlParameter[] commandParameters)
  {
   if( connectionString == null || connectionString.Length == 0 ) throw new ArgumentNullException( "connectionString" );
   if( commandText == null || commandText.Length == 0 ) throw new ArgumentNullException( "commandText" );

   string hashKey = connectionString + ":" + commandText;

   paramCache[hashKey] = commandParameters;
  }

  /// <summary>
  /// Retrieve a parameter array from the cache
  /// </summary>
  /// <param name="connectionString">A valid connection string for a SqlConnection</param>
  /// <param name="commandText">The stored procedure name or T-SQL command</param>
  /// <returns>An array of SqlParamters</returns>
  public static SqlParameter[] GetCachedParameterSet(string connectionString, string commandText)
  {
   if( connectionString == null || connectionString.Length == 0 ) throw new ArgumentNullException( "connectionString" );
   if( commandText == null || commandText.Length == 0 ) throw new ArgumentNullException( "commandText" );

   string hashKey = connectionString + ":" + commandText;

   SqlParameter[] cachedParameters = paramCache[hashKey] as SqlParameter[];
   if (cachedParameters == null)
   {   
    return null;
   }
   else
   {
    return CloneParameters(cachedParameters);
   }
  }

  #endregion caching functions

  #region Parameter Discovery Functions

  /// <summary>
  /// Retrieves the set of SqlParameters appropriate for the stored procedure
  /// </summary>
  /// <remarks>
  /// This method will query the database for this information, and then store it in a cache for future requests.
  /// </remarks>
  /// <param name="connectionString">A valid connection string for a SqlConnection</param>
  /// <param name="spName">The name of the stored procedure</param>
  /// <returns>An array of SqlParameters</returns>
  public static SqlParameter[] GetSpParameterSet(string connectionString, string spName)
  {
   return GetSpParameterSet(connectionString, spName, false);
  }

  /// <summary>
  /// Retrieves the set of SqlParameters appropriate for the stored procedure
  /// </summary>
  /// <remarks>
  /// This method will query the database for this information, and then store it in a cache for future requests.
  /// </remarks>
  /// <param name="connectionString">A valid connection string for a SqlConnection</param>
  /// <param name="spName">The name of the stored procedure</param>
  /// <param name="includeReturnValueParameter">A bool value indicating whether the return value parameter should be included in the results</param>
  /// <returns>An array of SqlParameters</returns>
  public static SqlParameter[] GetSpParameterSet(string connectionString, string spName, bool includeReturnValueParameter)
  {
   if( connectionString == null || connectionString.Length == 0 ) throw new ArgumentNullException( "connectionString" );
   if( spName == null || spName.Length == 0 ) throw new ArgumentNullException( "spName" );

   using(SqlConnection connection = new SqlConnection(connectionString))
   {
    return GetSpParameterSetInternal(connection, spName, includeReturnValueParameter);
   }
  }

  /// <summary>
  /// Retrieves the set of SqlParameters appropriate for the stored procedure
  /// </summary>
  /// <remarks>
  /// This method will query the database for this information, and then store it in a cache for future requests.
  /// </remarks>
  /// <param name="connection">A valid SqlConnection object</param>
  /// <param name="spName">The name of the stored procedure</param>
  /// <returns>An array of SqlParameters</returns>
  internal static SqlParameter[] GetSpParameterSet(SqlConnection connection, string spName)
  {
   return GetSpParameterSet(connection, spName, false);
  }

  /// <summary>
  /// Retrieves the set of SqlParameters appropriate for the stored procedure
  /// </summary>
  /// <remarks>
  /// This method will query the database for this information, and then store it in a cache for future requests.
  /// </remarks>
  /// <param name="connection">A valid SqlConnection object</param>
  /// <param name="spName">The name of the stored procedure</param>
  /// <param name="includeReturnValueParameter">A bool value indicating whether the return value parameter should be included in the results</param>
  /// <returns>An array of SqlParameters</returns>
  internal static SqlParameter[] GetSpParameterSet(SqlConnection connection, string spName, bool includeReturnValueParameter)
  {
   if( connection == null ) throw new ArgumentNullException( "connection" );
   using (SqlConnection clonedConnection = (SqlConnection)((ICloneable)connection).Clone())
   {
    return GetSpParameterSetInternal(clonedConnection, spName, includeReturnValueParameter);
   }
  }

  /// <summary>
  /// Retrieves the set of SqlParameters appropriate for the stored procedure
  /// </summary>
  /// <param name="connection">A valid SqlConnection object</param>
  /// <param name="spName">The name of the stored procedure</param>
  /// <param name="includeReturnValueParameter">A bool value indicating whether the return value parameter should be included in the results</param>
  /// <returns>An array of SqlParameters</returns>
  private static SqlParameter[] GetSpParameterSetInternal(SqlConnection connection, string spName, bool includeReturnValueParameter)
  {
   if( connection == null ) throw new ArgumentNullException( "connection" );
   if( spName == null || spName.Length == 0 ) throw new ArgumentNullException( "spName" );

   string hashKey = connection.ConnectionString + ":" + spName + (includeReturnValueParameter ? ":include ReturnValue Parameter":"");

   SqlParameter[] cachedParameters;
         
   cachedParameters = paramCache[hashKey] as SqlParameter[];
   if (cachedParameters == null)
   { 
    SqlParameter[] spParameters = DiscoverSpParameterSet(connection, spName, includeReturnValueParameter);
    paramCache[hashKey] = spParameters;
    cachedParameters = spParameters;
   }
         
   return CloneParameters(cachedParameters);
  }
       
  #endregion Parameter Discovery Functions

 }
}

 

public DataSet GetList(SooFan.Components.Structs.Pager pager,ref int totalcount)
  {
   SqlParameter[] parameters1 =
   {
    new SqlParameter("@tb",SqlDbType.VarChar,50),
    new SqlParameter("@col",SqlDbType.VarChar,50),
    new SqlParameter("@coltype",SqlDbType.Int),
    new SqlParameter("@orderby",SqlDbType.Bit),
    new SqlParameter("@collist",SqlDbType.VarChar,800),
    new SqlParameter("@pagesize",SqlDbType.Int),
    new SqlParameter("@page",SqlDbType.Int),
    new SqlParameter("@condition",SqlDbType.VarChar,800),
    new SqlParameter("@totalcount",SqlDbType.Int)
   };
   parameters1[0].Value = pager.tb;
   parameters1[1].Value = pager.col;
   parameters1[2].Value = pager.coltype;
   parameters1[3].Value = pager.orderby;
   parameters1[4].Value = pager.collist;
   parameters1[5].Value = pager.pagesize;
   parameters1[6].Value = pager.page;
   parameters1[7].Value = pager.condition;
   parameters1[8].Direction = ParameterDirection.Output;

   DataSet ds = SooFan.SqlDataProvider.SqlHelper.ExecuteDataset(conn,"pr_WebModules_Page",parameters1);
   totalcount = Convert.ToInt32(ds.Tables[1].Rows[0]["totalcount"].ToString());
   return(ds);
  }