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;
11using Web2ASPNET2.UserCommonOperation;
12
13public partial class Portal_Index:System.Web.UI.Page
14...{
15    protected void Page_Load(object sender,EventArgs e)
16    ...{    /**////判断用户是否登录
17        UserInfo info = (UserInfo)UserCommonOperation.GetUserInfo(Session);
18        if(info == null)
19        ...{   /**////返回到上一个页面
20            Response.Write("<script>history.back()</script>");
21            /**////跳转到登录页面
22            Server.Transfer("~/Portal/UserLogin.aspx");
23            return;
24        }
25    }
26}
27