在asp.net中统计在线用户无法正常工作

Question

我正在尝试显示访问网站的用户数量和在线用户数量...我在全球应用程序类（.asax.cs）中编写了此代码

    protected void Application_Start(object sender, EventArgs e)
    {
        Application.Add("counter", 0);
        Application.Add("onlineCounter", 0);
    }

    protected void Session_Start(object sender, EventArgs e)
    {
        Application.Lock();
        int _counter = (int)Application["counter"];
        _counter++;
        Application["counter"] = _counter;
        Application.UnLock();
        Application.Lock();
        int _onlineCounter = (int)Application["onlineCounter"];
        _onlineCounter++;
        Application["onlineCounter"] = _onlineCounter;
        Application.UnLock();
    }

    protected void Session_End(object sender, EventArgs e)
    {
        Application.Lock();
        int _onlineCounter = (int)Application["onlineCounter"];
        _onlineCounter--;
        Application["onlineCounter"] = _onlineCounter;
        Application.UnLock();
    }

面对我的问题......当第一次运行网站时，值= 1和在线用户= 1并且在此之后永远不会改变，即使我打开网站的另一个标签或刷新网站