protected void Application_Start()

{

    Application["OnLineUserCount"] = ;

    AreaRegistration.RegisterAllAreas();

    RegisterGlobalFilters(GlobalFilters.Filters);

    RegisterRoutes(RouteTable.Routes);

}

protected void Session_Start(object sender, EventArgs e)

{

    Application.Lock();

    Application["OnLineUserCount"] = Convert.ToInt32(Application["OnLineUserCount"]) + ;

    Application.UnLock();

}

protected void Session_End(object sender, EventArgs e)

{

    Application.Lock();

    Application["OnLineUserCount"] = Convert.ToInt32(Application["OnLineUserCount"]) - ;

    Application.UnLock();

}