Access数据库转换为sdf数据库及SqlCeHelper类

在做Mobile项目时遇到一个问题，我们的Mobile项目需要使用SqlCe数据库，而客户提供的带有原始数据的数据库是Access格式的，所以我们面临的第一个问题是将Access数据库（*.mdb）转换成SqlCe数据库（*.sdf）。网上搜索的很多资料是关于如何将SqlServer 2005与SqlCe数据进行同步，主要是通过发布订阅及RDA编程来实现，可以参考的资料有：

用 SQL Server Management Studio 管理 SQL Server Compact Edition 数据库

SQL CE 和 SQL Server 的同步

Step by Step: Program Microsoft SQL Server CE 2.0 Merge Replication Using .NET Compact Framework

    后来找到一个工具Data Port Wizard可以直接将其他数据库转换为SqlCe数据库，省了不少事。只是转换过程中遇到一个小小的问题，在客户提供的Access数据库的关系里设置了很多表与表之间的关系，但所有的表都没有设置主键，所以转换时就抛出异常。为了省事，我将Access表的关系全部删除，这样就顺利的将Access数据库转换成SqlCe 3.5版本的sdf数据库了。

    至于操作SqlCe的数据层的类，在网上找到一个SqlCeHelper.cs，转贴如下：

using System;using System.Data;using System.Data.SqlServerCe;using System.Configuration;using System.Collections;namespace SbuxMobile.DAL{    ///     /// The SqlCeHelper class is intended to encapsulate high performance, scalable best practices for     /// common uses of SqlClient    ///     public sealed partial class SqlCeHelper    {        #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 SqlCeHelper()"        private SqlCeHelper() { }        ///         /// This method is used to attach array of SqlCeParameters to a SqlCeCommand.        ///         /// 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.        ///         /// The command to which the parameters will be added        /// An array of SqlCeParameters to be added to command        private static void AttachParameters(SqlCeCommand command, SqlCeParameter[] commandParameters)        {            if (command == null) throw new ArgumentNullException("command");            if (commandParameters != null)            {                foreach (SqlCeParameter 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);                    }                }            }        }        ///         /// This method assigns dataRow column values to an array of SqlCeParameters        ///         /// Array of SqlCeParameters to be assigned values        /// The dataRow used to hold the stored procedure's parameter values        private static void AssignParameterValues(SqlCeParameter[] commandParameters, DataRow dataRow)        {            if ((commandParameters == null) || (dataRow == null))            {                // Do nothing if we get no data                return;            }            int i = 0;            // Set the parameters values            foreach (SqlCeParameter 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++;            }        }        ///         /// This method assigns an array of values to an array of SqlCeParameters        ///         /// Array of SqlCeParameters to be assigned values        /// Array of objects holding the values to be assigned        private static void AssignParameterValues(SqlCeParameter[] 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 SqlCeParameters, 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];                }            }        }        ///         /// This method opens (if necessary) and assigns a connection, transaction, command type and parameters         /// to the provided command        ///         /// The SqlCeCommand to be prepared        /// A valid SqlCeConnection, on which to execute this command        /// A valid SqlCeTransaction, or 'null'        /// The CommandType (stored procedure, text, etc.)        /// The stored procedure name or T-SQL command        /// An array of SqlCeParameters to be associated with the command or 'null' if no parameters are required        /// true if the connection was opened by the method, otherwose is false.        private static void PrepareCommand(SqlCeCommand command, SqlCeConnection connection, SqlCeTransaction transaction, CommandType commandType, string commandText, SqlCeParameter[] 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        ///         /// Execute a SqlCeCommand (that returns no resultset and takes no parameters) against the database specified in         /// the connection string        ///         ///         /// e.g.:          ///  int result = ExecuteNonQuery(connString, CommandType.StoredProcedure, "PublishOrders");        ///         /// A valid connection string for a SqlCeConnection        /// The CommandType (stored procedure, text, etc.)        /// The stored procedure name or T-SQL command        /// An int representing the number of rows affected by the command        public static int ExecuteNonQuery(string connectionString, CommandType commandType, string commandText)        {            // Pass through the call providing null for the set of SqlCeParameters            return ExecuteNonQuery(connectionString, commandType, commandText, (SqlCeParameter[])null);        }        ///         /// Execute a SqlCeCommand (that returns no resultset) against the database specified in the connection string         /// using the provided parameters        ///         ///         /// e.g.:          ///  int result = ExecuteNonQuery(connString, CommandType.StoredProcedure, "PublishOrders", new SqlCeParameter("@prodid", 24));        ///         /// A valid connection string for a SqlCeConnection        /// The CommandType (stored procedure, text, etc.)        /// The stored procedure name or T-SQL command        /// An array of SqlParamters used to execute the command        /// An int representing the number of rows affected by the command        public static int ExecuteNonQuery(string connectionString, CommandType commandType, string commandText, params SqlCeParameter[] commandParameters)        {            if (connectionString == null || connectionString.Length == 0) throw new ArgumentNullException("connectionString");            // Create & open a SqlCeConnection, and dispose of it after we are done            using (SqlCeConnection connection = new SqlCeConnection(connectionString))            {                connection.Open();                // Call the overload that takes a connection in place of the connection string                return ExecuteNonQuery(connection, commandType, commandText, commandParameters);            }        }        ///         /// Execute a stored procedure via a SqlCeCommand (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.        ///         ///         /// 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);        ///         /// A valid connection string for a SqlCeConnection        /// The name of the stored prcedure        /// An array of objects to be assigned as the input values of the stored procedure        /// An int representing the number of rows affected by the command        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)                SqlCeParameter[] commandParameters = SqlCeHelperParameterCache.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 SqlCeParameters                return ExecuteNonQuery(connectionString, CommandType.StoredProcedure, spName, commandParameters);            }            else            {                // Otherwise we can just call the SP without params                return ExecuteNonQuery(connectionString, CommandType.StoredProcedure, spName);            }        }        ///         /// Execute a SqlCeCommand (that returns no resultset and takes no parameters) against the provided SqlCeConnection.         ///         ///         /// e.g.:          ///  int result = ExecuteNonQuery(conn, CommandType.StoredProcedure, "PublishOrders");        ///         /// A valid SqlCeConnection        /// The CommandType (stored procedure, text, etc.)        /// The stored procedure name or T-SQL command        /// An int representing the number of rows affected by the command        public static int ExecuteNonQuery(SqlCeConnection connection, CommandType commandType, string commandText)        {            // Pass through the call providing null for the set of SqlCeParameters            return ExecuteNonQuery(connection, commandType, commandText, (SqlCeParameter[])null);        }        ///         /// Execute a SqlCeCommand (that returns no resultset) against the specified SqlCeConnection         /// using the provided parameters.        ///         ///         /// e.g.:          ///  int result = ExecuteNonQuery(conn, CommandType.StoredProcedure, "PublishOrders", new SqlCeParameter("@prodid", 24));        ///         /// A valid SqlCeConnection        /// The CommandType (stored procedure, text, etc.)        /// The stored procedure name or T-SQL command        /// An array of SqlParamters used to execute the command        /// An int representing the number of rows affected by the command        public static int ExecuteNonQuery(SqlCeConnection connection, CommandType commandType, string commandText, params SqlCeParameter[] commandParameters)        {            if (connection == null) throw new ArgumentNullException("connection");            // Create a command and prepare it for execution            SqlCeCommand cmd = new SqlCeCommand();            bool mustCloseConnection = false;            PrepareCommand(cmd, connection, (SqlCeTransaction)null, commandType, commandText, commandParameters, out mustCloseConnection);            // Finally, execute the command            int retval = cmd.ExecuteNonQuery();            // Detach the SqlCeParameters from the command object, so they can be used again            cmd.Parameters.Clear();            if (mustCloseConnection)                connection.Close();            return retval;        }        ///         /// Execute a stored procedure via a SqlCeCommand (that returns no resultset) against the specified SqlCeConnection         /// 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.        ///         ///         /// 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);        ///         /// A valid SqlCeConnection        /// The name of the stored procedure        /// An array of objects to be assigned as the input values of the stored procedure        /// An int representing the number of rows affected by the command        public static int ExecuteNonQuery(SqlCeConnection 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)                SqlCeParameter[] commandParameters = SqlCeHelperParameterCache.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 SqlCeParameters                return ExecuteNonQuery(connection, CommandType.StoredProcedure, spName, commandParameters);            }            else            {                // Otherwise we can just call the SP without params                return ExecuteNonQuery(connection, CommandType.StoredProcedure, spName);            }        }        ///         /// Execute a SqlCeCommand (that returns no resultset and takes no parameters) against the provided SqlCeTransaction.         ///         ///         /// e.g.:          ///  int result = ExecuteNonQuery(trans, CommandType.StoredProcedure, "PublishOrders");        ///         /// A valid SqlCeTransaction        /// The CommandType (stored procedure, text, etc.)        /// The stored procedure name or T-SQL command        /// An int representing the number of rows affected by the command        public static int ExecuteNonQuery(SqlCeTransaction transaction, CommandType commandType, string commandText)        {            // Pass through the call providing null for the set of SqlCeParameters            return ExecuteNonQuery(transaction, commandType, commandText, (SqlCeParameter[])null);        }        ///         /// Execute a SqlCeCommand (that returns no resultset) against the specified SqlCeTransaction        /// using the provided parameters.        ///         ///         /// e.g.:          ///  int result = ExecuteNonQuery(trans, CommandType.StoredProcedure, "GetOrders", new SqlCeParameter("@prodid", 24));        ///         /// A valid SqlCeTransaction        /// The CommandType (stored procedure, text, etc.)        /// The stored procedure name or T-SQL command        /// An array of SqlParamters used to execute the command        /// An int representing the number of rows affected by the command        public static int ExecuteNonQuery(SqlCeTransaction transaction, CommandType commandType, string commandText, params SqlCeParameter[] 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            SqlCeCommand cmd = new SqlCeCommand();            bool mustCloseConnection = false;            PrepareCommand(cmd, (SqlCeConnection)transaction.Connection, transaction, commandType, commandText, commandParameters, out mustCloseConnection);            // Finally, execute the command            int retval = cmd.ExecuteNonQuery();            // Detach the SqlCeParameters from the command object, so they can be used again            cmd.Parameters.Clear();            return retval;        }        ///         /// Execute a stored procedure via a SqlCeCommand (that returns no resultset) against the specified         /// SqlCeTransaction 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.        ///         ///         /// 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);        ///         /// A valid SqlCeTransaction        /// The name of the stored procedure        /// An array of objects to be assigned as the input values of the stored procedure        /// An int representing the number of rows affected by the command        public static int ExecuteNonQuery(SqlCeTransaction 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)                SqlCeParameter[] commandParameters = SqlCeHelperParameterCache.GetSpParameterSet((SqlCeConnection)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 SqlCeParameters                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 ExecuteDatatable        ///         /// Execute a SqlCeCommand (that returns a resultset and takes no parameters) against the database specified in         /// the connection string.         ///         ///         /// e.g.:          ///  DataTable dtb = ExecuteDataTable(connString, CommandType.StoredProcedure, "GetOrders");        ///         /// A valid connection string for a SqlCeConnection        /// The CommandType (stored procedure, text, etc.)        /// The stored procedure name or T-SQL command        /// A DataTable containing the resultset generated by the command        public static DataTable ExecuteDataTable(string connectionString, CommandType commandType, string commandText)        {            // Pass through the call providing null for the set of SqlCeParameters            return ExecuteDataTable(connectionString, commandType, commandText, (SqlCeParameter[])null);        }        ///         /// Execute a SqlCeCommand (that returns a resultset) against the database specified in the connection string         /// using the provided parameters.        ///         ///         /// e.g.:          ///  DataTable dtb = ExecuteDataTable(connString, CommandType.StoredProcedure, "GetOrders", new SqlCeParameter("@prodid", 24));        ///         /// A valid connection string for a SqlCeConnection        /// The CommandType (stored procedure, text, etc.)        /// The stored procedure name or T-SQL command        /// An array of SqlParamters used to execute the command        /// A DataTable containing the resultset generated by the command        public static DataTable ExecuteDataTable(string connectionString, CommandType commandType, string commandText, params SqlCeParameter[] commandParameters)        {            if (connectionString == null || connectionString.Length == 0) throw new ArgumentNullException("connectionString");            // Create & open a SqlCeConnection, and dispose of it after we are done            using (SqlCeConnection connection = new SqlCeConnection(connectionString))            {                connection.Open();                // Call the overload that takes a connection in place of the connection string                return ExecuteDataTable(connection, commandType, commandText, commandParameters);            }        }        ///         /// Execute a stored procedure via a SqlCeCommand (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.        ///         ///         /// This method provides no access to output parameters or the stored procedure's return value parameter.        ///         /// e.g.:          ///  DataTable dtb = ExecuteDataTable(connString, "GetOrders", 24, 36);        ///         /// A valid connection string for a SqlCeConnection        /// The name of the stored procedure        /// An array of objects to be assigned as the input values of the stored procedure        /// A DataTable containing the resultset generated by the command        public static DataTable ExecuteDataTable(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)                SqlCeParameter[] commandParameters = SqlCeHelperParameterCache.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 SqlCeParameters                return ExecuteDataTable(connectionString, CommandType.StoredProcedure, spName, commandParameters);            }            else            {                // Otherwise we can just call the SP without params                return ExecuteDataTable(connectionString, CommandType.StoredProcedure, spName);            }        }        ///         /// Execute a SqlCeCommand (that returns a resultset and takes no parameters) against the provided SqlCeConnection.         ///         ///         /// e.g.:          ///  DataTable dtb = ExecuteDataTable(conn, CommandType.StoredProcedure, "GetOrders");        ///         /// A valid SqlCeConnection        /// The CommandType (stored procedure, text, etc.)        /// The stored procedure name or T-SQL command        /// A DataTable containing the resultset generated by the command        public static DataTable ExecuteDataTable(SqlCeConnection connection, CommandType commandType, string commandText)        {            // Pass through the call providing null for the set of SqlCeParameters            return ExecuteDataTable(connection, commandType, commandText, (SqlCeParameter[])null);        }        ///         /// Execute a SqlCeCommand (that returns a resultset) against the specified SqlCeConnection         /// using the provided parameters.        ///         ///         /// e.g.:          ///  DataTable dtb = ExecuteDataTable(conn, CommandType.StoredProcedure, "GetOrders", new SqlCeParameter("@prodid", 24));        ///         /// A valid SqlCeConnection        /// The CommandType (stored procedure, text, etc.)        /// The stored procedure name or T-SQL command        /// An array of SqlParamters used to execute the command        /// A DataTable containing the resultset generated by the command        public static DataTable ExecuteDataTable(SqlCeConnection connection, CommandType commandType, string commandText, params SqlCeParameter[] commandParameters)        {            if (connection == null) throw new ArgumentNullException("connection");            // Create a command and prepare it for execution            SqlCeCommand cmd = new SqlCeCommand();            bool mustCloseConnection = false;            PrepareCommand(cmd, connection, (SqlCeTransaction)null, commandType, commandText, commandParameters, out mustCloseConnection);            // Create the DataAdapter & DataTable            using (SqlCeDataAdapter da = new SqlCeDataAdapter(cmd))            {                DataTable dtb = new DataTable();                dtb.Clear();                // Fill the DataTable using default values for DataTable names, etc                da.Fill(dtb);                // Detach the SqlCeParameters from the command object, so they can be used again                cmd.Parameters.Clear();                if (mustCloseConnection)                    connection.Close();                // Return the DataTable                return dtb;            }        }        ///         /// Execute a stored procedure via a SqlCeCommand (that returns a resultset) against the specified SqlCeConnection         /// 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.        ///         ///         /// This method provides no access to output parameters or the stored procedure's return value parameter.        ///         /// e.g.:          ///  DataTable dtb = ExecuteDataTable(conn, "GetOrders", 24, 36);        ///         /// A valid SqlCeConnection        /// The name of the stored procedure        /// An array of objects to be assigned as the input values of the stored procedure        /// A DataTable containing the resultset generated by the command        public static DataTable ExecuteDataTable(SqlCeConnection 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)                SqlCeParameter[] commandParameters = SqlCeHelperParameterCache.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 SqlCeParameters                return ExecuteDataTable(connection, CommandType.StoredProcedure, spName, commandParameters);            }            else            {                // Otherwise we can just call the SP without params                return ExecuteDataTable(connection, CommandType.StoredProcedure, spName);            }        }        ///         /// Execute a SqlCeCommand (that returns a resultset and takes no parameters) against the provided SqlCeTransaction.         ///         ///         /// e.g.:          ///  DataTable dtb = ExecuteDataTable(trans, CommandType.StoredProcedure, "GetOrders");        ///         /// A valid SqlCeTransaction        /// The CommandType (stored procedure, text, etc.)        /// The stored procedure name or T-SQL command        /// A DataTable containing the resultset generated by the command        public static DataTable ExecuteDataTable(SqlCeTransaction transaction, CommandType commandType, string commandText)        {            // Pass through the call providing null for the set of SqlCeParameters            return ExecuteDataTable(transaction, commandType, commandText, (SqlCeParameter[])null);        }        ///         /// Execute a SqlCeCommand (that returns a resultset) against the specified SqlCeTransaction        /// using the provided parameters.        ///         ///         /// e.g.:          ///  DataTable dtb = ExecuteDataTable(trans, CommandType.StoredProcedure, "GetOrders", new SqlCeParameter("@prodid", 24));        ///         /// A valid SqlCeTransaction        /// The CommandType (stored procedure, text, etc.)        /// The stored procedure name or T-SQL command        /// An array of SqlParamters used to execute the command        /// A DataTable containing the resultset generated by the command        public static DataTable ExecuteDataTable(SqlCeTransaction transaction, CommandType commandType, string commandText, params SqlCeParameter[] 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            SqlCeCommand cmd = new SqlCeCommand();            bool mustCloseConnection = false;            PrepareCommand(cmd, (SqlCeConnection)transaction.Connection, transaction, commandType, commandText, commandParameters, out mustCloseConnection);            // Create the DataAdapter & DataTable            using (SqlCeDataAdapter da = new SqlCeDataAdapter(cmd))            {                DataTable dtb = new DataTable();                // Fill the DataTable using default values for DataTable names, etc                da.Fill(dtb);                // Detach the SqlCeParameters from the command object, so they can be used again                cmd.Parameters.Clear();                // Return the DataTable                return dtb;            }        }        ///         /// Execute a stored procedure via a SqlCeCommand (that returns a resultset) against the specified         /// SqlCeTransaction 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.        ///         ///         /// This method provides no access to output parameters or the stored procedure's return value parameter.        ///         /// e.g.:          ///  DataTable dtb = ExecuteDataTable(trans, "GetOrders", 24, 36);        ///         /// A valid SqlCeTransaction        /// The name of the stored procedure        /// An array of objects to be assigned as the input values of the stored procedure        /// A DataTable containing the resultset generated by the command        public static DataTable ExecuteDataTable(SqlCeTransaction 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)                SqlCeParameter[] commandParameters = SqlCeHelperParameterCache.GetSpParameterSet((SqlCeConnection)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 SqlCeParameters                return ExecuteDataTable(transaction, CommandType.StoredProcedure, spName, commandParameters);            }            else            {                // Otherwise we can just call the SP without params                return ExecuteDataTable(transaction, CommandType.StoredProcedure, spName);            }        }        #endregion ExecuteDataTable        #region ExecuteDataset        ///         /// Execute a SqlCeCommand (that returns a resultset and takes no parameters) against the database specified in         /// the connection string.         ///         ///         /// e.g.:          ///  DataSet ds = ExecuteDataset(connString, CommandType.StoredProcedure, "GetOrders");        ///         /// A valid connection string for a SqlCeConnection        /// The CommandType (stored procedure, text, etc.)        /// The stored procedure name or T-SQL command        /// A dataset containing the resultset generated by the command        public static DataSet ExecuteDataset(string connectionString, CommandType commandType, string commandText)        {            // Pass through the call providing null for the set of SqlCeParameters            return ExecuteDataset(connectionString, commandType, commandText, (SqlCeParameter[])null);        }        ///         /// Execute a SqlCeCommand (that returns a resultset) against the database specified in the connection string         /// using the provided parameters.        ///         ///         /// e.g.:          ///  DataSet ds = ExecuteDataset(connString, CommandType.StoredProcedure, "GetOrders", new SqlCeParameter("@prodid", 24));        ///         /// A valid connection string for a SqlCeConnection        /// The CommandType (stored procedure, text, etc.)        /// The stored procedure name or T-SQL command        /// An array of SqlParamters used to execute the command        /// A dataset containing the resultset generated by the command        public static DataSet ExecuteDataset(string connectionString, CommandType commandType, string commandText, params SqlCeParameter[] commandParameters)        {            if (connectionString == null || connectionString.Length == 0) throw new ArgumentNullException("connectionString");            // Create & open a SqlCeConnection, and dispose of it after we are done            using (SqlCeConnection connection = new SqlCeConnection(connectionString))            {                connection.Open();                // Call the overload that takes a connection in place of the connection string                return ExecuteDataset(connection, commandType, commandText, commandParameters);            }        }        ///         /// Execute a stored procedure via a SqlCeCommand (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.        ///         ///         /// 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);        ///         /// A valid connection string for a SqlCeConnection        /// The name of the stored procedure        /// An array of objects to be assigned as the input values of the stored procedure        /// A dataset containing the resultset generated by the command        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)                SqlCeParameter[] commandParameters = SqlCeHelperParameterCache.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 SqlCeParameters                return ExecuteDataset(connectionString, CommandType.StoredProcedure, spName, commandParameters);            }            else            {                // Otherwise we can just call the SP without params                return ExecuteDataset(connectionString, CommandType.StoredProcedure, spName);            }        }        ///         /// Execute a SqlCeCommand (that returns a resultset and takes no parameters) against the provided SqlCeConnection.         ///         ///         /// e.g.:          ///  DataSet ds = ExecuteDataset(conn, CommandType.StoredProcedure, "GetOrders");        ///         /// A valid SqlCeConnection        /// The CommandType (stored procedure, text, etc.)        /// The stored procedure name or T-SQL command        /// A dataset containing the resultset generated by the command        public static DataSet ExecuteDataset(SqlCeConnection connection, CommandType commandType, string commandText)        {            // Pass through the call providing null for the set of SqlCeParameters            return ExecuteDataset(connection, commandType, commandText, (SqlCeParameter[])null);        }        ///         /// Execute a SqlCeCommand (that returns a resultset) against the specified SqlCeConnection         /// using the provided parameters.        ///         ///         /// e.g.:          ///  DataSet ds = ExecuteDataset(conn, CommandType.StoredProcedure, "GetOrders", new SqlCeParameter("@prodid", 24));        ///         /// A valid SqlCeConnection        /// The CommandType (stored procedure, text, etc.)        /// The stored procedure name or T-SQL command        /// An array of SqlParamters used to execute the command        /// A dataset containing the resultset generated by the command        public static DataSet ExecuteDataset(SqlCeConnection connection, CommandType commandType, string commandText, params SqlCeParameter[] commandParameters)        {            if (connection == null) throw new ArgumentNullException("connection");            // Create a command and prepare it for execution            SqlCeCommand cmd = new SqlCeCommand();            bool mustCloseConnection = false;            PrepareCommand(cmd, connection, (SqlCeTransaction)null, commandType, commandText, commandParameters, out mustCloseConnection);            // Create the DataAdapter & DataSet            using (SqlCeDataAdapter da = new SqlCeDataAdapter(cmd))            {                DataSet ds = new DataSet();                // Fill the DataSet using default values for DataTable names, etc                da.Fill(ds);                // Detach the SqlCeParameters from the command object, so they can be used again                cmd.Parameters.Clear();                if (mustCloseConnection)                    connection.Close();                // Return the dataset                return ds;            }        }        ///         /// Execute a stored procedure via a SqlCeCommand (that returns a resultset) against the specified SqlCeConnection         /// 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.        ///         ///         /// 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);        ///         /// A valid SqlCeConnection        /// The name of the stored procedure        /// An array of objects to be assigned as the input values of the stored procedure        /// A dataset containing the resultset generated by the command        public static DataSet ExecuteDataset(SqlCeConnection 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)                SqlCeParameter[] commandParameters = SqlCeHelperParameterCache.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 SqlCeParameters                return ExecuteDataset(connection, CommandType.StoredProcedure, spName, commandParameters);            }            else            {                // Otherwise we can just call the SP without params                return ExecuteDataset(connection, CommandType.StoredProcedure, spName);            }        }        ///         /// Execute a SqlCeCommand (that returns a resultset and takes no parameters) against the provided SqlCeTransaction.         ///         ///         /// e.g.:          ///  DataSet ds = ExecuteDataset(trans, CommandType.StoredProcedure, "GetOrders");        ///         /// A valid SqlCeTransaction        /// The CommandType (stored procedure, text, etc.)        /// The stored procedure name or T-SQL command        /// A dataset containing the resultset generated by the command        public static DataSet ExecuteDataset(SqlCeTransaction transaction, CommandType commandType, string commandText)        {            // Pass through the call providing null for the set of SqlCeParameters            return ExecuteDataset(transaction, commandType, commandText, (SqlCeParameter[])null);        }        ///         /// Execute a SqlCeCommand (that returns a resultset) against the specified SqlCeTransaction        /// using the provided parameters.        ///         ///         /// e.g.:          ///  DataSet ds = ExecuteDataset(trans, CommandType.StoredProcedure, "GetOrders", new SqlCeParameter("@prodid", 24));        ///         /// A valid SqlCeTransaction        /// The CommandType (stored procedure, text, etc.)        /// The stored procedure name or T-SQL command        /// An array of SqlParamters used to execute the command        /// A dataset containing the resultset generated by the command        public static DataSet ExecuteDataset(SqlCeTransaction transaction, CommandType commandType, string commandText, params SqlCeParameter[] 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            SqlCeCommand cmd = new SqlCeCommand();            bool mustCloseConnection = false;            PrepareCommand(cmd, (SqlCeConnection)transaction.Connection, transaction, commandType, commandText, commandParameters, out mustCloseConnection);            // Create the DataAdapter & DataSet            using (SqlCeDataAdapter da = new SqlCeDataAdapter(cmd))            {                DataSet ds = new DataSet();                // Fill the DataSet using default values for DataTable names, etc                da.Fill(ds);                // Detach the SqlCeParameters from the command object, so they can be used again                cmd.Parameters.Clear();                // Return the dataset                return ds;            }        }        ///         /// Execute a stored procedure via a SqlCeCommand (that returns a resultset) against the specified         /// SqlCeTransaction 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.        ///         ///         /// 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);        ///         /// A valid SqlCeTransaction        /// The name of the stored procedure        /// An array of objects to be assigned as the input values of the stored procedure        /// A dataset containing the resultset generated by the command        public static DataSet ExecuteDataset(SqlCeTransaction 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)                SqlCeParameter[] commandParameters = SqlCeHelperParameterCache.GetSpParameterSet((SqlCeConnection)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 SqlCeParameters                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        ///         /// This enum is used to indicate whether the connection was provided by the caller, or created by SqlCeHelper, so that        /// we can set the appropriate CommandBehavior when calling ExecuteReader()        ///         private enum SqlCeConnectionOwnership        {            /// Connection is owned and managed by SqlCeHelper            Internal,            /// Connection is owned and managed by the caller            External        }        ///         /// Create and prepare a SqlCeCommand, and call ExecuteReader with the appropriate CommandBehavior.        ///         ///         /// 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.        ///         /// A valid SqlCeConnection, on which to execute this command        /// A valid SqlCeTransaction, or 'null'        /// The CommandType (stored procedure, text, etc.)        /// The stored procedure name or T-SQL command        /// An array of SqlCeParameters to be associated with the command or 'null' if no parameters are required        /// Indicates whether the connection parameter was provided by the caller, or created by SqlCeHelper        /// SqlCeDataReader containing the results of the command        private static SqlCeDataReader ExecuteReader(SqlCeConnection connection, SqlCeTransaction transaction, CommandType commandType, string commandText, SqlCeParameter[] commandParameters, SqlCeConnectionOwnership connectionOwnership)        {            if (connection == null) throw new ArgumentNullException("connection");            bool mustCloseConnection = false;            // Create a command and prepare it for execution            SqlCeCommand cmd = new SqlCeCommand();            try            {                PrepareCommand(cmd, connection, transaction, commandType, commandText, commandParameters, out mustCloseConnection);                // Create a reader                SqlCeDataReader dataReader;                // Call ExecuteReader with the appropriate CommandBehavior                if (connectionOwnership == SqlCeConnectionOwnership.External)                {                    dataReader = cmd.ExecuteReader();                }                else                {                    dataReader = cmd.ExecuteReader(CommandBehavior.CloseConnection);                }                // Detach the SqlCeParameters 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 (SqlCeParameter commandParameter in cmd.Parameters)                {                    if (commandParameter.Direction != ParameterDirection.Input)                        canClear = false;                }                if (canClear)                {                    cmd.Parameters.Clear();                }                return dataReader;            }            catch            {                if (mustCloseConnection)                    connection.Close();                throw;            }        }        ///         /// Execute a SqlCeCommand (that returns a resultset and takes no parameters) against the database specified in         /// the connection string.         ///         ///         /// e.g.:          ///  SqlCeDataReader dr = ExecuteReader(connString, CommandType.StoredProcedure, "GetOrders");        ///         /// A valid connection string for a SqlCeConnection        /// The CommandType (stored procedure, text, etc.)        /// The stored procedure name or T-SQL command        /// A SqlCeDataReader containing the resultset generated by the command        public static SqlCeDataReader ExecuteReader(string connectionString, CommandType commandType, string commandText)        {            // Pass through the call providing null for the set of SqlCeParameters            return ExecuteReader(connectionString, commandType, commandText, (SqlCeParameter[])null);        }        ///         /// Execute a SqlCeCommand (that returns a resultset) against the database specified in the connection string         /// using the provided parameters.        ///         ///         /// e.g.:          ///  SqlCeDataReader dr = ExecuteReader(connString, CommandType.StoredProcedure, "GetOrders", new SqlCeParameter("@prodid", 24));        ///         /// A valid connection string for a SqlCeConnection        /// The CommandType (stored procedure, text, etc.)        /// The stored procedure name or T-SQL command        /// An array of SqlParamters used to execute the command        /// A SqlCeDataReader containing the resultset generated by the command        public static SqlCeDataReader ExecuteReader(string connectionString, CommandType commandType, string commandText, params SqlCeParameter[] commandParameters)        {            if (connectionString == null || connectionString.Length == 0) throw new ArgumentNullException("connectionString");            SqlCeConnection connection = null;            try            {                connection = new SqlCeConnection(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, SqlCeConnectionOwnership.Internal);            }            catch            {                // If we fail to return the SqlDatReader, we need to close the connection ourselves                if (connection != null) connection.Close();                throw;            }        }        ///         /// Execute a stored procedure via a SqlCeCommand (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.        ///         ///         /// This method provides no access to output parameters or the stored procedure's return value parameter.        ///         /// e.g.:          ///  SqlCeDataReader dr = ExecuteReader(connString, "GetOrders", 24, 36);        ///         /// A valid connection string for a SqlCeConnection        /// The name of the stored procedure        /// An array of objects to be assigned as the input values of the stored procedure        /// A SqlCeDataReader containing the resultset generated by the command        public static SqlCeDataReader 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))            {                SqlCeParameter[] commandParameters = SqlCeHelperParameterCache.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);            }        }        ///         /// Execute a SqlCeCommand (that returns a resultset and takes no parameters) against the provided SqlCeConnection.         ///         ///         /// e.g.:          ///  SqlCeDataReader dr = ExecuteReader(conn, CommandType.StoredProcedure, "GetOrders");        ///         /// A valid SqlCeConnection        /// The CommandType (stored procedure, text, etc.)        /// The stored procedure name or T-SQL command        /// A SqlCeDataReader containing the resultset generated by the command        public static SqlCeDataReader ExecuteReader(SqlCeConnection connection, CommandType commandType, string commandText)        {            // Pass through the call providing null for the set of SqlCeParameters            return ExecuteReader(connection, commandType, commandText, (SqlCeParameter[])null);        }        ///         /// Execute a SqlCeCommand (that returns a resultset) against the specified SqlCeConnection         /// using the provided parameters.        ///         ///         /// e.g.:          ///  SqlCeDataReader dr = ExecuteReader(conn, CommandType.StoredProcedure, "GetOrders", new SqlCeParameter("@prodid", 24));        ///         /// A valid SqlCeConnection        /// The CommandType (stored procedure, text, etc.)        /// The stored procedure name or T-SQL command        /// An array of SqlParamters used to execute the command        /// A SqlCeDataReader containing the resultset generated by the command        public static SqlCeDataReader ExecuteReader(SqlCeConnection connection, CommandType commandType, string commandText, params SqlCeParameter[] commandParameters)        {            // Pass through the call to the private overload using a null transaction value and an externally owned connection            return ExecuteReader(connection, (SqlCeTransaction)null, commandType, commandText, commandParameters, SqlCeConnectionOwnership.External);        }        ///         /// Execute a stored procedure via a SqlCeCommand (that returns a resultset) against the specified SqlCeConnection         /// 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.        ///         ///         /// This method provides no access to output parameters or the stored procedure's return value parameter.        ///         /// e.g.:          ///  SqlCeDataReader dr = ExecuteReader(conn, "GetOrders", 24, 36);        ///         /// A valid SqlCeConnection        /// The name of the stored procedure        /// An array of objects to be assigned as the input values of the stored procedure        /// A SqlCeDataReader containing the resultset generated by the command        public static SqlCeDataReader ExecuteReader(SqlCeConnection 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))            {                SqlCeParameter[] commandParameters = SqlCeHelperParameterCache.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);            }        }        ///         /// Execute a SqlCeCommand (that returns a resultset and takes no parameters) against the provided SqlCeTransaction.         ///         ///         /// e.g.:          ///  SqlCeDataReader dr = ExecuteReader(trans, CommandType.StoredProcedure, "GetOrders");        ///         /// A valid SqlCeTransaction        /// The CommandType (stored procedure, text, etc.)        /// The stored procedure name or T-SQL command        /// A SqlCeDataReader containing the resultset generated by the command        public static SqlCeDataReader ExecuteReader(SqlCeTransaction transaction, CommandType commandType, string commandText)        {            // Pass through the call providing null for the set of SqlCeParameters            return ExecuteReader(transaction, commandType, commandText, (SqlCeParameter[])null);        }        ///         /// Execute a SqlCeCommand (that returns a resultset) against the specified SqlCeTransaction        /// using the provided parameters.        ///         ///         /// e.g.:          ///   SqlCeDataReader dr = ExecuteReader(trans, CommandType.StoredProcedure, "GetOrders", new SqlCeParameter("@prodid", 24));        ///         /// A valid SqlCeTransaction        /// The CommandType (stored procedure, text, etc.)        /// The stored procedure name or T-SQL command        /// An array of SqlParamters used to execute the command        /// A SqlCeDataReader containing the resultset generated by the command        public static SqlCeDataReader ExecuteReader(SqlCeTransaction transaction, CommandType commandType, string commandText, params SqlCeParameter[] 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((SqlCeConnection)transaction.Connection, transaction, commandType, commandText, commandParameters, SqlCeConnectionOwnership.External);        }        ///         /// Execute a stored procedure via a SqlCeCommand (that returns a resultset) against the specified        /// SqlCeTransaction 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.        ///         ///         /// This method provides no access to output parameters or the stored procedure's return value parameter.        ///         /// e.g.:          ///  SqlCeDataReader dr = ExecuteReader(trans, "GetOrders", 24, 36);        ///         /// A valid SqlCeTransaction        /// The name of the stored procedure        /// An array of objects to be assigned as the input values of the stored procedure        /// A SqlCeDataReader containing the resultset generated by the command        public static SqlCeDataReader ExecuteReader(SqlCeTransaction 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))            {                SqlCeParameter[] commandParameters = SqlCeHelperParameterCache.GetSpParameterSet((SqlCeConnection)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        ///         /// Execute a SqlCeCommand (that returns a 1x1 resultset and takes no parameters) against the database specified in         /// the connection string.         ///         ///         /// e.g.:          ///  int orderCount = (int)ExecuteScalar(connString, CommandType.StoredProcedure, "GetOrderCount");        ///         /// A valid connection string for a SqlCeConnection        /// The CommandType (stored procedure, text, etc.)        /// The stored procedure name or T-SQL command        /// An object containing the value in the 1x1 resultset generated by the command        public static object ExecuteScalar(string connectionString, CommandType commandType, string commandText)        {            // Pass through the call providing null for the set of SqlCeParameters            return ExecuteScalar(connectionString, commandType, commandText, (SqlCeParameter[])null);        }        ///         /// Execute a SqlCeCommand (that returns a 1x1 resultset) against the database specified in the connection string         /// using the provided parameters.        ///         ///         /// e.g.:          ///  int orderCount = (int)ExecuteScalar(connString, CommandType.StoredProcedure, "GetOrderCount", new SqlCeParameter("@prodid", 24));        ///         /// A valid connection string for a SqlCeConnection        /// The CommandType (stored procedure, text, etc.)        /// The stored procedure name or T-SQL command        /// An array of SqlParamters used to execute the command        /// An object containing the value in the 1x1 resultset generated by the command        public static object ExecuteScalar(string connectionString, CommandType commandType, string commandText, params SqlCeParameter[] commandParameters)        {            if (connectionString == null || connectionString.Length == 0) throw new ArgumentNullException("connectionString");            // Create & open a SqlCeConnection, and dispose of it after we are done            using (SqlCeConnection connection = new SqlCeConnection(connectionString))            {                connection.Open();                // Call the overload that takes a connection in place of the connection string                return ExecuteScalar(connection, commandType, commandText, commandParameters);            }        }        ///         /// Execute a stored procedure via a SqlCeCommand (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.        ///         ///         /// 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);        ///         /// A valid connection string for a SqlCeConnection        /// The name of the stored procedure        /// An array of objects to be assigned as the input values of the stored procedure        /// An object containing the value in the 1x1 resultset generated by the command        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)                SqlCeParameter[] commandParameters = SqlCeHelperParameterCache.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 SqlCeParameters                return ExecuteScalar(connectionString, CommandType.StoredProcedure, spName, commandParameters);            }            else            {                // Otherwise we can just call the SP without params                return ExecuteScalar(connectionString, CommandType.StoredProcedure, spName);            }        }        ///         /// Execute a SqlCeCommand (that returns a 1x1 resultset and takes no parameters) against the provided SqlCeConnection.         ///         ///         /// e.g.:          ///  int orderCount = (int)ExecuteScalar(conn, CommandType.StoredProcedure, "GetOrderCount");        ///         /// A valid SqlCeConnection        /// The CommandType (stored procedure, text, etc.)        /// The stored procedure name or T-SQL command        /// An object containing the value in the 1x1 resultset generated by the command        public static object ExecuteScalar(SqlCeConnection connection, CommandType commandType, string commandText)        {            // Pass through the call providing null for the set of SqlCeParameters            return ExecuteScalar(connection, commandType, commandText, (SqlCeParameter[])null);        }        ///         /// Execute a SqlCeCommand (that returns a 1x1 resultset) against the specified SqlCeConnection         /// using the provided parameters.        ///         ///         /// e.g.:          ///  int orderCount = (int)ExecuteScalar(conn, CommandType.StoredProcedure, "GetOrderCount", new SqlCeParameter("@prodid", 24));        ///         /// A valid SqlCeConnection        /// The CommandType (stored procedure, text, etc.)        /// The stored procedure name or T-SQL command        /// An array of SqlParamters used to execute the command        /// An object containing the value in the 1x1 resultset generated by the command        public static object ExecuteScalar(SqlCeConnection connection, CommandType commandType, string commandText, params SqlCeParameter[] commandParameters)        {            if (connection == null) throw new ArgumentNullException("connection");            // Create a command and prepare it for execution            SqlCeCommand cmd = new SqlCeCommand();            bool mustCloseConnection = false;            PrepareCommand(cmd, connection, (SqlCeTransaction)null, commandType, commandText, commandParameters, out mustCloseConnection);            // Execute the command & return the results            object retval = cmd.ExecuteScalar();            // Detach the SqlCeParameters from the command object, so they can be used again            cmd.Parameters.Clear();            if (mustCloseConnection)                connection.Close();            return retval;        }        ///         /// Execute a stored procedure via a SqlCeCommand (that returns a 1x1 resultset) against the specified SqlCeConnection         /// 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.        ///         ///         /// 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);        ///         /// A valid SqlCeConnection        /// The name of the stored procedure        /// An array of objects to be assigned as the input values of the stored procedure        /// An object containing the value in the 1x1 resultset generated by the command        public static object ExecuteScalar(SqlCeConnection 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)                SqlCeParameter[] commandParameters = SqlCeHelperParameterCache.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 SqlCeParameters                return ExecuteScalar(connection, CommandType.StoredProcedure, spName, commandParameters);            }            else            {                // Otherwise we can just call the SP without params                return ExecuteScalar(connection, CommandType.StoredProcedure, spName);            }        }        ///         /// Execute a SqlCeCommand (that returns a 1x1 resultset and takes no parameters) against the provided SqlCeTransaction.         ///         ///         /// e.g.:          ///  int orderCount = (int)ExecuteScalar(trans, CommandType.StoredProcedure, "GetOrderCount");        ///         /// A valid SqlCeTransaction        /// The CommandType (stored procedure, text, etc.)        /// The stored procedure name or T-SQL command        /// An object containing the value in the 1x1 resultset generated by the command        public static object ExecuteScalar(SqlCeTransaction transaction, CommandType commandType, string commandText)        {            // Pass through the call providing null for the set of SqlCeParameters            return ExecuteScalar(transaction, commandType, commandText, (SqlCeParameter[])null);        }        ///         /// Execute a SqlCeCommand (that returns a 1x1 resultset) against the specified SqlCeTransaction        /// using the provided parameters.        ///         ///         /// e.g.:          ///  int orderCount = (int)ExecuteScalar(trans, CommandType.StoredProcedure, "GetOrderCount", new SqlCeParameter("@prodid", 24));        ///         /// A valid SqlCeTransaction        /// The CommandType (stored procedure, text, etc.)        /// The stored procedure name or T-SQL command        /// An array of SqlParamters used to execute the command        /// An object containing the value in the 1x1 resultset generated by the command        public static object ExecuteScalar(SqlCeTransaction transaction, CommandType commandType, string commandText, params SqlCeParameter[] 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            SqlCeCommand cmd = new SqlCeCommand();            bool mustCloseConnection = false;            PrepareCommand(cmd, (SqlCeConnection)transaction.Connection, transaction, commandType, commandText, commandParameters, out mustCloseConnection);            // Execute the command & return the results            object retval = cmd.ExecuteScalar();            // Detach the SqlCeParameters from the command object, so they can be used again            cmd.Parameters.Clear();            return retval;        }        ///         /// Execute a stored procedure via a SqlCeCommand (that returns a 1x1 resultset) against the specified        /// SqlCeTransaction 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.        ///         ///         /// 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);        ///         /// A valid SqlCeTransaction        /// The name of the stored procedure        /// An array of objects to be assigned as the input values of the stored procedure        /// An object containing the value in the 1x1 resultset generated by the command        public static object ExecuteScalar(SqlCeTransaction 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)                SqlCeParameter[] commandParameters = SqlCeHelperParameterCache.GetSpParameterSet((SqlCeConnection)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 SqlCeParameters                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 FillDataset        ///         /// Execute a SqlCeCommand (that returns a resultset and takes no parameters) against the database specified in         /// the connection string.         ///         ///         /// e.g.:          ///  FillDataset(connString, CommandType.StoredProcedure, "GetOrders", ds, new string[] {"orders"});        ///         /// A valid connection string for a SqlCeConnection        /// The CommandType (stored procedure, text, etc.)        /// The stored procedure name or T-SQL command        /// A dataset wich will contain the resultset generated by the command        /// 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)        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 SqlCeConnection, and dispose of it after we are done            using (SqlCeConnection connection = new SqlCeConnection(connectionString))            {                connection.Open();                // Call the overload that takes a connection in place of the connection string                FillDataset(connection, commandType, commandText, dataSet, tableNames);            }        }        ///         /// Execute a SqlCeCommand (that returns a resultset) against the database specified in the connection string         /// using the provided parameters.        ///         ///         /// e.g.:          ///  FillDataset(connString, CommandType.StoredProcedure, "GetOrders", ds, new string[] {"orders"}, new SqlCeParameter("@prodid", 24));        ///         /// A valid connection string for a SqlCeConnection        /// The CommandType (stored procedure, text, etc.)        /// The stored procedure name or T-SQL command        /// An array of SqlParamters used to execute the command        /// A dataset wich will contain the resultset generated by the command        /// 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)        ///         public static void FillDataset(string connectionString, CommandType commandType,            string commandText, DataSet dataSet, string[] tableNames,            params SqlCeParameter[] commandParameters)        {            if (connectionString == null || connectionString.Length == 0) throw new ArgumentNullException("connectionString");            if (dataSet == null) throw new ArgumentNullException("dataSet");            // Create & open a SqlCeConnection, and dispose of it after we are done            using (SqlCeConnection connection = new SqlCeConnection(connectionString))            {                connection.Open();                // Call the overload that takes a connection in place of the connection string                FillDataset(connection, commandType, commandText, dataSet, tableNames, commandParameters);            }        }        ///         /// Execute a stored procedure via a SqlCeCommand (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.        ///         ///         /// 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);        ///         /// A valid connection string for a SqlCeConnection        /// The name of the stored procedure        /// A dataset wich will contain the resultset generated by the command        /// 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)        ///             /// An array of objects to be assigned as the input values of the stored procedure        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 SqlCeConnection, and dispose of it after we are done            using (SqlCeConnection connection = new SqlCeConnection(connectionString))            {                connection.Open();                // Call the overload that takes a connection in place of the connection string                FillDataset(connection, spName, dataSet, tableNames, parameterValues);            }        }        ///         /// Execute a SqlCeCommand (that returns a resultset and takes no parameters) against the provided SqlCeConnection.         ///         ///         /// e.g.:          ///  FillDataset(conn, CommandType.StoredProcedure, "GetOrders", ds, new string[] {"orders"});        ///         /// A valid SqlCeConnection        /// The CommandType (stored procedure, text, etc.)        /// The stored procedure name or T-SQL command        /// A dataset wich will contain the resultset generated by the command        /// 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)        ///             public static void FillDataset(SqlCeConnection connection, CommandType commandType,            string commandText, DataSet dataSet, string[] tableNames)        {            FillDataset(connection, commandType, commandText, dataSet, tableNames, null);        }        ///         /// Execute a SqlCeCommand (that returns a resultset) against the specified SqlCeConnection         /// using the provided parameters.        ///         ///         /// e.g.:          ///  FillDataset(conn, CommandType.StoredProcedure, "GetOrders", ds, new string[] {"orders"}, new SqlCeParameter("@prodid", 24));        ///         /// A valid SqlCeConnection        /// The CommandType (stored procedure, text, etc.)        /// The stored procedure name or T-SQL command        /// A dataset wich will contain the resultset generated by the command        /// 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)        ///         /// An array of SqlParamters used to execute the command        public static void FillDataset(SqlCeConnection connection, CommandType commandType,            string commandText, DataSet dataSet, string[] tableNames,            params SqlCeParameter[] commandParameters)        {            FillDataset(connection, null, commandType, commandText, dataSet, tableNames, commandParameters);        }        ///         /// Execute a stored procedure via a SqlCeCommand (that returns a resultset) against the specified SqlCeConnection         /// 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.        ///         ///         /// 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);        ///         /// A valid SqlCeConnection        /// The name of the stored procedure        /// A dataset wich will contain the resultset generated by the command        /// 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)        ///         /// An array of objects to be assigned as the input values of the stored procedure        public static void FillDataset(SqlCeConnection 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)                SqlCeParameter[] commandParameters = SqlCeHelperParameterCache.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 SqlCeParameters                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);            }        }        ///         /// Execute a SqlCeCommand (that returns a resultset and takes no parameters) against the provided SqlCeTransaction.         ///         ///         /// e.g.:          ///  FillDataset(trans, CommandType.StoredProcedure, "GetOrders", ds, new string[] {"orders"});        ///         /// A valid SqlCeTransaction        /// The CommandType (stored procedure, text, etc.)        /// The stored procedure name or T-SQL command        /// A dataset wich will contain the resultset generated by the command        /// 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)        ///         public static void FillDataset(SqlCeTransaction transaction, CommandType commandType,            string commandText,            DataSet dataSet, string[] tableNames)        {            FillDataset(transaction, commandType, commandText, dataSet, tableNames, null);        }        ///         /// Execute a SqlCeCommand (that returns a resultset) against the specified SqlCeTransaction        /// using the provided parameters.        ///         ///         /// e.g.:          ///  FillDataset(trans, CommandType.StoredProcedure, "GetOrders", ds, new string[] {"orders"}, new SqlCeParameter("@prodid", 24));        ///         /// A valid SqlCeTransaction        /// The CommandType (stored procedure, text, etc.)        /// The stored procedure name or T-SQL command        /// A dataset wich will contain the resultset generated by the command        /// 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)        ///         /// An array of SqlParamters used to execute the command        public static void FillDataset(SqlCeTransaction transaction, CommandType commandType,            string commandText, DataSet dataSet, string[] tableNames,            params SqlCeParameter[] commandParameters)        {            FillDataset((SqlCeConnection)transaction.Connection, transaction, commandType, commandText, dataSet, tableNames, commandParameters);        }        ///         /// Execute a stored procedure via a SqlCeCommand (that returns a resultset) against the specified         /// SqlCeTransaction 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.        ///         ///         /// 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);        ///         /// A valid SqlCeTransaction        /// The name of the stored procedure        /// A dataset wich will contain the resultset generated by the command        /// 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)        ///         /// An array of objects to be assigned as the input values of the stored procedure        public static void FillDataset(SqlCeTransaction 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)                SqlCeParameter[] commandParameters = SqlCeHelperParameterCache.GetSpParameterSet((SqlCeConnection)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 SqlCeParameters                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);            }        }        ///         /// Private helper method that execute a SqlCeCommand (that returns a resultset) against the specified SqlCeTransaction and SqlCeConnection        /// using the provided parameters.        ///         ///         /// e.g.:          ///  FillDataset(conn, trans, CommandType.StoredProcedure, "GetOrders", ds, new string[] {"orders"}, new SqlCeParameter("@prodid", 24));        ///         /// A valid SqlCeConnection        /// A valid SqlCeTransaction        /// The CommandType (stored procedure, text, etc.)        /// The stored procedure name or T-SQL command        /// A dataset wich will contain the resultset generated by the command        /// 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)        ///         /// An array of SqlParamters used to execute the command        private static void FillDataset(SqlCeConnection connection, SqlCeTransaction transaction, CommandType commandType,            string commandText, DataSet dataSet, string[] tableNames,            params SqlCeParameter[] commandParameters)        {            if (connection == null) throw new ArgumentNullException("connection");            if (dataSet == null) throw new ArgumentNullException("dataSet");            // Create a command and prepare it for execution            SqlCeCommand command = new SqlCeCommand();            bool mustCloseConnection = false;            PrepareCommand(command, connection, transaction, commandType, commandText, commandParameters, out mustCloseConnection);            // Create the DataAdapter & DataSet            using (SqlCeDataAdapter dataAdapter = new SqlCeDataAdapter(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 SqlCeParameters from the command object, so they can be used again                command.Parameters.Clear();            }            if (mustCloseConnection)                connection.Close();        }        #endregion        #region UpdateDataset        ///         /// Executes the respective command for each inserted, updated, or deleted row in the DataSet.        ///         ///         /// e.g.:          ///  UpdateDataset(conn, insertCommand, deleteCommand, updateCommand, dataSet, "Order");        ///         /// A valid transact-SQL statement or stored procedure to insert new records into the data source        /// A valid transact-SQL statement or stored procedure to delete records from the data source        /// A valid transact-SQL statement or stored procedure used to update records in the data source        /// The DataSet used to update the data source        /// The DataTable used to update the data source.        public static void UpdateDataset(SqlCeCommand insertCommand, SqlCeCommand deleteCommand, SqlCeCommand 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 SqlCeDataAdapter, and dispose of it after we are done            using (SqlCeDataAdapter dataAdapter = new SqlCeDataAdapter())            {                // 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        ///         /// Simplify the creation of a Sql command object by allowing        /// a stored procedure and optional parameters to be provided        ///         ///         /// e.g.:          ///  SqlCeCommand command = CreateCommand(conn, "AddCustomer", "CustomerID", "CustomerName");        ///         /// A valid SqlCeConnection object        /// The name of the stored procedure        /// An array of string to be assigned as the source columns of the stored procedure parameters        /// A valid SqlCeCommand object        public static SqlCeCommand CreateCommand(SqlCeConnection 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 SqlCeCommand            SqlCeCommand cmd = new SqlCeCommand(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)                SqlCeParameter[] commandParameters = SqlCeHelperParameterCache.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 SqlCeCommand object                AttachParameters(cmd, commandParameters);            }            return cmd;        }        #endregion        #region ExecuteNonQueryTypedParams        ///         /// Execute a stored procedure via a SqlCeCommand (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.        ///         /// A valid connection string for a SqlCeConnection        /// The name of the stored procedure        /// The dataRow used to hold the stored procedure's parameter values.        /// An int representing the number of rows affected by the command        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)                SqlCeParameter[] commandParameters = SqlCeHelperParameterCache.GetSpParameterSet(connectionString, spName);                // Set the parameters values                AssignParameterValues(commandParameters, dataRow);                return SqlCeHelper.ExecuteNonQuery(connectionString, CommandType.StoredProcedure, spName, commandParameters);            }            else            {                return SqlCeHelper.ExecuteNonQuery(connectionString, CommandType.StoredProcedure, spName);            }        }        ///         /// Execute a stored procedure via a SqlCeCommand (that returns no resultset) against the specified SqlCeConnection         /// 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.        ///         /// A valid SqlCeConnection object        /// The name of the stored procedure        /// The dataRow used to hold the stored procedure's parameter values.        /// An int representing the number of rows affected by the command        public static int ExecuteNonQueryTypedParams(SqlCeConnection 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)                SqlCeParameter[] commandParameters = SqlCeHelperParameterCache.GetSpParameterSet(connection, spName);                // Set the parameters values                AssignParameterValues(commandParameters, dataRow);                return SqlCeHelper.ExecuteNonQuery(connection, CommandType.StoredProcedure, spName, commandParameters);            }            else            {                return SqlCeHelper.ExecuteNonQuery(connection, CommandType.StoredProcedure, spName);            }        }        ///         /// Execute a stored procedure via a SqlCeCommand (that returns no resultset) against the specified        /// SqlCeTransaction 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.        ///         /// A valid SqlCeTransaction object        /// The name of the stored procedure        /// The dataRow used to hold the stored procedure's parameter values.        /// An int representing the number of rows affected by the command        public static int ExecuteNonQueryTypedParams(SqlCeTransaction 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)                SqlCeParameter[] commandParameters = SqlCeHelperParameterCache.GetSpParameterSet((SqlCeConnection)transaction.Connection, spName);                // Set the parameters values                AssignParameterValues(commandParameters, dataRow);                return SqlCeHelper.ExecuteNonQuery(transaction, CommandType.StoredProcedure, spName, commandParameters);            }            else            {                return SqlCeHelper.ExecuteNonQuery(transaction, CommandType.StoredProcedure, spName);            }        }        #endregion        #region ExecuteDatasetTypedParams        ///         /// Execute a stored procedure via a SqlCeCommand (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.        ///         /// A valid connection string for a SqlCeConnection        /// The name of the stored procedure        /// The dataRow used to hold the stored procedure's parameter values.        /// A dataset containing the resultset generated by the command        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)                SqlCeParameter[] commandParameters = SqlCeHelperParameterCache.GetSpParameterSet(connectionString, spName);                // Set the parameters values                AssignParameterValues(commandParameters, dataRow);                return SqlCeHelper.ExecuteDataset(connectionString, CommandType.StoredProcedure, spName, commandParameters);            }            else            {                return SqlCeHelper.ExecuteDataset(connectionString, CommandType.StoredProcedure, spName);            }        }        ///         /// Execute a stored procedure via a SqlCeCommand (that returns a resultset) against the specified SqlCeConnection         /// 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.        ///         /// A valid SqlCeConnection object        /// The name of the stored procedure        /// The dataRow used to hold the stored procedure's parameter values.        /// A dataset containing the resultset generated by the command        public static DataSet ExecuteDatasetTypedParams(SqlCeConnection 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)                SqlCeParameter[] commandParameters = SqlCeHelperParameterCache.GetSpParameterSet(connection, spName);                // Set the parameters values                AssignParameterValues(commandParameters, dataRow);                return SqlCeHelper.ExecuteDataset(connection, CommandType.StoredProcedure, spName, commandParameters);            }            else            {                return SqlCeHelper.ExecuteDataset(connection, CommandType.StoredProcedure, spName);            }        }        ///         /// Execute a stored procedure via a SqlCeCommand (that returns a resultset) against the specified SqlCeTransaction         /// 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.        ///         /// A valid SqlCeTransaction object        /// The name of the stored procedure        /// The dataRow used to hold the stored procedure's parameter values.        /// A dataset containing the resultset generated by the command        public static DataSet ExecuteDatasetTypedParams(SqlCeTransaction 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)                SqlCeParameter[] commandParameters = SqlCeHelperParameterCache.GetSpParameterSet((SqlCeConnection)transaction.Connection, spName);                // Set the parameters values                AssignParameterValues(commandParameters, dataRow);                return SqlCeHelper.ExecuteDataset(transaction, CommandType.StoredProcedure, spName, commandParameters);            }            else            {                return SqlCeHelper.ExecuteDataset(transaction, CommandType.StoredProcedure, spName);            }        }        #endregion        #region ExecuteReaderTypedParams        ///         /// Execute a stored procedure via a SqlCeCommand (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.        ///         /// A valid connection string for a SqlCeConnection        /// The name of the stored procedure        /// The dataRow used to hold the stored procedure's parameter values.        /// A SqlCeDataReader containing the resultset generated by the command        public static SqlCeDataReader 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)                SqlCeParameter[] commandParameters = SqlCeHelperParameterCache.GetSpParameterSet(connectionString, spName);                // Set the parameters values                AssignParameterValues(commandParameters, dataRow);                return SqlCeHelper.ExecuteReader(connectionString, CommandType.StoredProcedure, spName, commandParameters);            }            else            {                return SqlCeHelper.ExecuteReader(connectionString, CommandType.StoredProcedure, spName);            }        }        ///         /// Execute a stored procedure via a SqlCeCommand (that returns a resultset) against the specified SqlCeConnection         /// 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.        ///         /// A valid SqlCeConnection object        /// The name of the stored procedure        /// The dataRow used to hold the stored procedure's parameter values.        /// A SqlCeDataReader containing the resultset generated by the command        public static SqlCeDataReader ExecuteReaderTypedParams(SqlCeConnection 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)                SqlCeParameter[] commandParameters = SqlCeHelperParameterCache.GetSpParameterSet(connection, spName);                // Set the parameters values                AssignParameterValues(commandParameters, dataRow);                return SqlCeHelper.ExecuteReader(connection, CommandType.StoredProcedure, spName, commandParameters);            }            else            {                return SqlCeHelper.ExecuteReader(connection, CommandType.StoredProcedure, spName);            }        }        ///         /// Execute a stored procedure via a SqlCeCommand (that returns a resultset) against the specified SqlCeTransaction         /// 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.        ///         /// A valid SqlCeTransaction object        /// The name of the stored procedure        /// The dataRow used to hold the stored procedure's parameter values.        /// A SqlCeDataReader containing the resultset generated by the command        public static SqlCeDataReader ExecuteReaderTypedParams(SqlCeTransaction 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)                SqlCeParameter[] commandParameters = SqlCeHelperParameterCache.GetSpParameterSet((SqlCeConnection)transaction.Connection, spName);                // Set the parameters values                AssignParameterValues(commandParameters, dataRow);                return SqlCeHelper.ExecuteReader(transaction, CommandType.StoredProcedure, spName, commandParameters);            }            else            {                return SqlCeHelper.ExecuteReader(transaction, CommandType.StoredProcedure, spName);            }        }        #endregion        #region ExecuteScalarTypedParams        ///         /// Execute a stored procedure via a SqlCeCommand (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.        ///         /// A valid connection string for a SqlCeConnection        /// The name of the stored procedure        /// The dataRow used to hold the stored procedure's parameter values.        /// An object containing the value in the 1x1 resultset generated by the command        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)                SqlCeParameter[] commandParameters = SqlCeHelperParameterCache.GetSpParameterSet(connectionString, spName);                // Set the parameters values                AssignParameterValues(commandParameters, dataRow);                return SqlCeHelper.ExecuteScalar(connectionString, CommandType.StoredProcedure, spName, commandParameters);            }            else            {                return SqlCeHelper.ExecuteScalar(connectionString, CommandType.StoredProcedure, spName);            }        }        ///         /// Execute a stored procedure via a SqlCeCommand (that returns a 1x1 resultset) against the specified SqlCeConnection         /// 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.        ///         /// A valid SqlCeConnection object        /// The name of the stored procedure        /// The dataRow used to hold the stored procedure's parameter values.        /// An object containing the value in the 1x1 resultset generated by the command        public static object ExecuteScalarTypedParams(SqlCeConnection 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)                SqlCeParameter[] commandParameters = SqlCeHelperParameterCache.GetSpParameterSet(connection, spName);                // Set the parameters values                AssignParameterValues(commandParameters, dataRow);                return SqlCeHelper.ExecuteScalar(connection, CommandType.StoredProcedure, spName, commandParameters);            }            else            {                return SqlCeHelper.ExecuteScalar(connection, CommandType.StoredProcedure, spName);            }        }        ///         /// Execute a stored procedure via a SqlCeCommand (that returns a 1x1 resultset) against the specified SqlCeTransaction        /// 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.        ///         /// A valid SqlCeTransaction object        /// The name of the stored procedure        /// The dataRow used to hold the stored procedure's parameter values.        /// An object containing the value in the 1x1 resultset generated by the command        public static object ExecuteScalarTypedParams(SqlCeTransaction 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)                SqlCeParameter[] commandParameters = SqlCeHelperParameterCache.GetSpParameterSet((SqlCeConnection)transaction.Connection, spName);                // Set the parameters values                AssignParameterValues(commandParameters, dataRow);                return SqlCeHelper.ExecuteScalar(transaction, CommandType.StoredProcedure, spName, commandParameters);            }            else            {                return SqlCeHelper.ExecuteScalar(transaction, CommandType.StoredProcedure, spName);            }        }        #endregion    }    ///     /// SqlCeHelperParameterCache provides functions to leverage a static cache of procedure parameters, and the    /// ability to discover parameters for stored procedures at run-time.    ///     public sealed class SqlCeHelperParameterCache    {        #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 SqlCeHelperParameterCache()"        private SqlCeHelperParameterCache() { }        private static Hashtable paramCache = Hashtable.Synchronized(new Hashtable());        ///         /// Resolve at run time the appropriate set of SqlCeParameters for a stored procedure        ///         /// A valid SqlCeConnection object        /// The name of the stored procedure        /// Whether or not to include their return value parameter        /// The parameter array discovered.        private static SqlCeParameter[] DiscoverSpParameterSet(SqlCeConnection connection, string spName, bool includeReturnValueParameter)        {            if (connection == null) throw new ArgumentNullException("connection");            if (spName == null || spName.Length == 0) throw new ArgumentNullException("spName");            SqlCeCommand cmd = new SqlCeCommand(spName, connection);            cmd.CommandType = CommandType.StoredProcedure;            connection.Open();            //SqlCeCommandBuilder.DeriveParameters(cmd);            connection.Close();            if (!includeReturnValueParameter)            {                cmd.Parameters.RemoveAt(0);            }            SqlCeParameter[] discoveredParameters = new SqlCeParameter[cmd.Parameters.Count];            cmd.Parameters.CopyTo(discoveredParameters, 0);            // Init the parameters with a DBNull value            foreach (SqlCeParameter discoveredParameter in discoveredParameters)            {                discoveredParameter.Value = DBNull.Value;            }            return discoveredParameters;        }        ///         /// Deep copy of cached SqlCeParameter array        ///         ///         ///         private static SqlCeParameter[] CloneParameters(SqlCeParameter[] originalParameters)        {            SqlCeParameter[] clonedParameters = new SqlCeParameter[originalParameters.Length];            for (int i = 0, j = originalParameters.Length; i < j; i++)            {                clonedParameters[i] = (SqlCeParameter)((ICloneable)originalParameters[i]).Clone();            }            return clonedParameters;        }        #endregion private methods, variables, and constructors        #region caching functions        ///         /// Add parameter array to the cache        ///         /// A valid connection string for a SqlCeConnection        /// The stored procedure name or T-SQL command        /// An array of SqlParamters to be cached        public static void CacheParameterSet(string connectionString, string commandText, params SqlCeParameter[] 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;        }        ///         /// Retrieve a parameter array from the cache        ///         /// A valid connection string for a SqlCeConnection        /// The stored procedure name or T-SQL command        /// An array of SqlParamters        public static SqlCeParameter[] 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;            SqlCeParameter[] cachedParameters = paramCache[hashKey] as SqlCeParameter[];            if (cachedParameters == null)            {                return null;            }            else            {                return CloneParameters(cachedParameters);            }        }        #endregion caching functions        #region Parameter Discovery Functions        ///         /// Retrieves the set of SqlCeParameters appropriate for the stored procedure        ///         ///         /// This method will query the database for this information, and then store it in a cache for future requests.        ///         /// A valid connection string for a SqlCeConnection        /// The name of the stored procedure        /// An array of SqlCeParameters        public static SqlCeParameter[] GetSpParameterSet(string connectionString, string spName)        {            return GetSpParameterSet(connectionString, spName, false);        }        ///         /// Retrieves the set of SqlCeParameters appropriate for the stored procedure        ///         ///         /// This method will query the database for this information, and then store it in a cache for future requests.        ///         /// A valid connection string for a SqlCeConnection        /// The name of the stored procedure        /// A bool value indicating whether the return value parameter should be included in the results        /// An array of SqlCeParameters        public static SqlCeParameter[] 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 (SqlCeConnection connection = new SqlCeConnection(connectionString))            {                return GetSpParameterSetInternal(connection, spName, includeReturnValueParameter);            }        }        ///         /// Retrieves the set of SqlCeParameters appropriate for the stored procedure        ///         ///         /// This method will query the database for this information, and then store it in a cache for future requests.        ///         /// A valid SqlCeConnection object        /// The name of the stored procedure        /// An array of SqlCeParameters        internal static SqlCeParameter[] GetSpParameterSet(SqlCeConnection connection, string spName)        {            return GetSpParameterSet(connection, spName, false);        }        ///         /// Retrieves the set of SqlCeParameters appropriate for the stored procedure        ///         ///         /// This method will query the database for this information, and then store it in a cache for future requests.        ///         /// A valid SqlCeConnection object        /// The name of the stored procedure        /// A bool value indicating whether the return value parameter should be included in the results        /// An array of SqlCeParameters        internal static SqlCeParameter[] GetSpParameterSet(SqlCeConnection connection, string spName, bool includeReturnValueParameter)        {            if (connection == null) throw new ArgumentNullException("connection");            using (SqlCeConnection clonedConnection = connection)            {                return GetSpParameterSetInternal(clonedConnection, spName, includeReturnValueParameter);            }        }        ///         /// Retrieves the set of SqlCeParameters appropriate for the stored procedure        ///         /// A valid SqlCeConnection object        /// The name of the stored procedure        /// A bool value indicating whether the return value parameter should be included in the results        /// An array of SqlCeParameters        private static SqlCeParameter[] GetSpParameterSetInternal(SqlCeConnection 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" : "");            SqlCeParameter[] cachedParameters;            cachedParameters = paramCache[hashKey] as SqlCeParameter[];            if (cachedParameters == null)            {                SqlCeParameter[] spParameters = DiscoverSpParameterSet(connection, spName, includeReturnValueParameter);                paramCache[hashKey] = spParameters;                cachedParameters = spParameters;            }            return CloneParameters(cachedParameters);        }        #endregion Parameter Discovery Functions    }}