1using System;
 2using System.Data;
 3using System.Configuration;
 4using System.Collections;
 5using System.Web;
 6using System.Web.Security;
 7using System.Web.UI;
 8using System.Web.UI.WebControls;
 9using System.Web.UI.WebControls.WebParts;
10using System.Web.UI.HtmlControls;
11//该源码下载自www.51aspx.com(５１ａｓｐｘ．ｃｏｍ)
12
13public partial class BackGround_Default : System.Web.UI.Page
14...{
15    protected void Page_Load(object sender, EventArgs e)
16    ...{
17        if (!IsPostBack)
18        ...{
19            try
20            ...{
21                if (Session["UserName"].ToString().ToLower() != "51aspx".ToLower())
22                    WebMessageBox.Show("请登录后方可进入网站后台！", "../Logon.aspx");
23            }
24            catch ...{ }
25        }
26    }
27    public void PageExit()
28    ...{
29        Session["UserName"] = "";
30        Response.Write("../Default.aspx");
31    }
32}
33