App_Code/DAL/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;
using System.Web;
using System.Web.Security;
using System.Web.UI;
using System.Web.Security;
using System.Web.UI;
using System.Web.UI.WebControls;
using System.Web.UI.WebControls.WebParts;
using System.Web.UI.HtmlControls;
/// <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(  ConfigurationManager.ConnectionStrings["ConnectionString"].ConnectionString);
    }
    /// <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)
    {