protected void Application_Start(){    Application["OnLineUserCount"] = 0;    AreaRegistration.RegisterAllAreas();    RegisterGlobalFilters(GlobalFilters.Filters);    RegisterRoutes(RouteTable.Routes);}protected void Session_Start(object sender, EventArgs e){    Application.Lock();    Application["OnLineUserCount"] = Convert.ToInt32(Application["OnLineUserCount"]) + 1;    Application.UnLock();}protected void Session_End(object sender, EventArgs e){    Application.Lock();    Application["OnLineUserCount"] = Convert.ToInt32(Application["OnLineUserCount"]) - 1;    Application.UnLock();}