protected void Application_Start()
{
AreaRegistration.RegisterAllAreas();
GlobalConfiguration.Configure(WebApiConfig.Register);
FilterConfig.RegisterGlobalFilters(GlobalFilters.Filters);
RouteConfig.RegisterRoutes(RouteTable.Routes);
BundleConfig.RegisterBundles(BundleTable.Bundles);
ViewEngines.Engines.Clear();
ViewEngines.Engines.Add(new RazorViewEngine());
ModelMetadataProviders.Current = new CachedDataAnnotationsModelMetadataProvider();
// clear all sessions used for online users count
SessionTracker.RemoveAllSessions();
}