Asp.net(c#)数据库操作类

using System;using System.Data;using System.Configuration;using System.Web;using System.Web.Security;using System.Web.UI;using System.Web.UI.WebControls;using System.Web.UI.WebControls.WebParts;using System.Web.UI.HtmlControls;using System.Data.SqlClient;namespace Mysqlserver{    /// <summary>    /// SqlServerDataBase 的摘要说明    /// </summary>    public class SqlServerDataBase    {        private string strError = null;        private int intCount = 0;        public SqlServerDataBase()        {            //            // TODO: 在此处添加构造函数逻辑            //        }        /// <summary>        /// 公开方法DBConn，返回数据库连接        /// </summary>        /// <returns></returns>        public SqlConnection DBconn()        {            string strConn = "Server=(local);Database=GlobalMeetings;Uid=sa;pwd=";            try            {                return new SqlConnection(strConn);            }            catch (Exception)            {                return null;            }        }        /// <summary>        /// 公开属性ErrorMessage，返回错误信息        /// </summary>        public string ErrorMessage        {            get            {                return strError;            }        }        /// <summary>        /// 根据查询语句从数据库检索数据        /// </summary>        /// <param name="strSelect">查询语句</param>        /// <param name="SqlConn">数据库连接</param>        /// <returns>有数据则返回DataSet对象，否则返回null</returns>        public DataSet Select(string SelectString, SqlConnection sqlConn)        {            strError = "";            SqlConnection conn;            if (sqlConn == null)            {                conn = DBconn();            }            else            {                conn = sqlConn;            }            try            {                //若数据库连接的当前状态是关闭的，则打开连接                if (conn.State == ConnectionState.Closed)                {                    conn.Open();                }                SqlDataAdapter mySqlDataAdapter = new SqlDataAdapter();                SqlCommand selectCommand = new SqlCommand(SelectString, conn);                selectCommand.CommandType = CommandType.Text;                mySqlDataAdapter.SelectCommand = selectCommand;                DataSet myDS = new DataSet();                mySqlDataAdapter.Fill(myDS);                return myDS;            }            catch (Exception e)            {                strError = "数据检索失败：" + e.Message;                return null;            }            finally            {                if (conn.State != ConnectionState.Closed)                {                    conn.Close();                }            }        }        /// <summary>        /// 更新数据库        /// </summary>        /// <param name="UpdateString">Update Sql语句</param>        /// <param name="SqlConn">数据库连接</param>        /// <returns>更新成功返回true</returns>        public bool Update(string UpdateString, SqlConnection SqlConn)        {            return udiDataBase(UpdateString, SqlConn);        }        /// <summary>        /// 从数据库中删除数据        /// </summary>        /// <param name="DeleteString">Delete Sql语句</param>        /// <param name="SqlConn">数据库连接</param>        /// <returns>删除成功返回true</returns>        public bool Delete(string DeleteString, SqlConnection SqlConn)        {            return udiDataBase(DeleteString, SqlConn);        }        /// <summary>        /// 把数据插入数据库        /// </summary>        /// <param name="InsertString">Insert Sql语句</param>        /// <param name="SqlConn">数据库连接</param>        /// <returns>插入成功返回true</returns>        public bool Insert(string InsertString, SqlConnection SqlConn)        {            return udiDataBase(InsertString, SqlConn);        }        /// <summary>        /// 根据Sql语句更新数据库        /// </summary>        /// <param name="UDIString">更新语句</param>        /// <param name="SqlConn">数据库连接</param>        /// <returns>更新成功则返回true</returns>        public bool udiDataBase(string UDIString, SqlConnection SqlConn)        {            strError = "";            SqlConnection conn;            if (SqlConn == null)            {                conn = DBconn();            }            else            {                conn = SqlConn;            }            try            {                if (conn.State == ConnectionState.Closed)                {                    conn.Open();                }                SqlCommand cmd = new SqlCommand(UDIString, conn);                cmd.CommandType = CommandType.Text;                intCount = cmd.ExecuteNonQuery();                return !(intCount < 1);            }            catch (Exception e)            {                strError = "更新数据库失败：" + e.Message;                return false;            }            finally            {                if (conn.State != ConnectionState.Closed)                {                    conn.Close();                }            }        }    }}