新建一个全局应用程序类Global.asax和一个Web窗体Default.aspx

Global.asax.cs代码：

        protected void Application_Start(object sender, EventArgs e)
        {
            Application["count"]= 0;
        }
        protected void Session_Start(object sender, EventArgs e)
        {
            Application.Lock();
            Application["count"] = (int) Application["count"] + 1;
            Application.UnLock();
        }
        protected void Session_End(object sender, EventArgs e)
        {
            Application.Lock();
            Application["count"] = (int)Application["count"] - 1;
            Application.UnLock();
        }

Default.aspx.cs代码：

        protected void Page_Load(object sender, EventArgs e)
        {
            Label1.Text ="访问量"+ Application["count"].ToString();
        }

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