MasterPage/MasterPage.master.cs

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using System;
using System.Data;
using System.Configuration;
using System.Collections;
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;

public partial class Master_MasterPage : System.Web.UI.MasterPage
{

    protected bool Check()
    {
        Response.Buffer = true;
        Response.CacheControl = "no-cache";
        Response.Expires = -1000;
        Response.AppendHeader("pragma", "no-cache");
        Response.AppendHeader("cache-control", "private");
        Response.Cache.SetExpires(DateTime.Now.AddSeconds(-10));
        Response.Cache.SetCacheability(HttpCacheability.NoCache);
        Response.Cache.SetValidUntilExpires(false);


        Response.Cache.SetCacheability(HttpCacheability.NoCache); //不缓存网页
        if (Session["UserName"] == null || Session["UserName"].ToString() == "")
        {
            return true;
        }
        else
        {
            return false;
        }
    }

    protected void Page_Load(object sender, EventArgs e)
    {
        if (!IsPostBack)
        {
            if (Check())
            {
                Response.Redirect("../Login.aspx");
            }
        }
        getday getday = new getday();
        lblMsg.Text = "Welcome Home:" + Session["UserName"];
        lblDateTime.Text = "今天是"+" " + DateTime.Now.Year + "年" + DateTime.Now.Month + "月" + DateTime.Now.Day + "日";
        lblWeek.Text = getday.getWeek();
    }

}