App_Code/DB.cs

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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;

/// <summary>
/// DB 的摘要说明
/// </summary>
public class DB
{

	public DB()
	{
    }    private readonly string SqlConnectionString = ConfigurationManager.ConnectionStrings["ConnectionString"].ConnectionString;
        private  SqlConnection con;
        private  SqlCommand cmd;
        private  SqlDataAdapter sda;
        private SqlDataReader sdr;
        private DataSet ds;
        private DataView dv;
       private SqlParameter param;   
        /// <summary>
        /// 打开数据库连接
        /// </summary>
        public void OpenDataBase()
        {
            con = new SqlConnection(SqlConnectionString);
            con.Open();
        }
        /// <summary>
        /// 关闭数据库连接
        /// </summary>
        public void CloseDataBase()
        {
            if (con != null)
            {
                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 void  GetDs(string SqlStr,string TableName)
        {
            OpenDataBase();
            sda = new SqlDataAdapter(SqlStr,con);
            ds = new DataSet();
            sda.Fill(ds,TableName);
            CloseDataBase();
     
        }