App_Code/SqlHelper.cs

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using System;
using System.Collections.Generic;
using System.Text;
using System.Configuration;
using System.Collections;
using System.Data.SqlClient;
using System.Data;

/// <summary>
/// SqlHelper 的摘要说明
/// </summary>
public class SqlHelper
{
    public static readonly string connstring = ConfigurationManager.ConnectionStrings["ConnectionString"].ConnectionString; 
        private static Hashtable parmCache = Hashtable.Synchronized(new Hashtable());
        private SqlConnection con;
        private SqlCommand cmd;

        private SqlDataAdapter sda;
        private SqlDataReader sdr;
        private DataSet ds;
        private DataView dv;

    public static SqlConnection getConnection()//定义成静态的，很重要！
        {
            return new SqlConnection(connstring);
        }
        /// <summary>
        /// 打开数据库连接
        /// </summary>
        public void OpenDataBase()
        {
            con = new SqlConnection(connstring);
            con.Open();
        }
        /// <summary>
        /// 关闭数据库连接
        /// </summary>
        public void CloseDataBase()
        {

            con.Close();
            con.Dispose();

        }
        /// <summary>
        /// 返回DataSet数据集
        /// </summary>
        /// <param name="SqlStr">数据库查询字符串</param>
        /// <returns>dataset</returns>
        public DataSet GetDs(string SqlStr, string TableName)
        {
            OpenDataBase();
            sda = new SqlDataAdapter(SqlStr, con);
            ds = new DataSet();
            sda.Fill(ds, TableName);
            CloseDataBase();
            return ds;
        }
        public DataView GetDv(string SqlStr)