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
12public partial class admin_left : System.Web.UI.Page
13...{
14    protected void Page_Load(object sender, EventArgs e)
15    ...{
16        if (Session["aid"] == null)
17        ...{ Response.Write("<script language=javascript>top.location.href='login.aspx';alert('您未登录！');</script>"); }
18    }
19}
20