Web/App_Code/PageBase.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.HtmlControls;
using System.Web.UI.WebControls;
using System.Web.UI.WebControls.WebParts;

/// <summary>
///PageBase 的摘要说明
/// </summary>
public class PageBase:Page
{
	public PageBase()
	{
		//
		//TODO: 在此处添加构造函数逻辑
		//

        Load += new EventHandler(CommonPage_Load);
	}

    void CommonPage_Load(object sender, EventArgs e)
    {
        if (Session["userId"] == null)
        {
            Page.ClientScript.RegisterStartupScript(this.GetType(), "alert", "<script>alert('登录超时！');top.location.href='login.aspx';</script>");
        }

        //如果不存在会员会话信息则跳转到用户登录页面

    }
}