[AllowRpc]
        public static void NewDossiersAdministratifs(Guid serviceKey, INotificationManager notificationManager, EntityManager entityManager)
        {
            _serviceKey = serviceKey;
            _notificationManager = notificationManager;
            _manager = new AdministratifEntities(entityManager);
 
            while (true)
            {
                Check();
                // Sleep de 30 seconds entre les checks
                Thread.Sleep(1000 * 30);
            }
        }
 
        private static void Check()
        {
            var subscribers = _notificationManager.GetSubscribers(_serviceKey); 
            if (!subscribers.Any()) return;
 
            var ids = new List<int>() {1, 2};
            foreach (var subscriber in subscribers)
            {
                _notificationManager.Send(_serviceKey, subscriber, ids);
            }
        }

<script language="C#" runat="server">
 
    /// <summary>
    /// Perform application start activities.  
    /// </summary>
    protected void Application_Start(Object sender, EventArgs e) {
 
      // To enable remote viewing of trace messages via the TraceViewer:
      // TODO:  Comment/uncomment the following line as appropriate for your installation
      //IdeaBlade.Core.TracePublisher.LocalInstance.MakeRemotable();     
      
      // Register a virtual path provider for *.svc files.  
      // You do not need to supply .svc files for the EntityService and EntityServer services
      // when the provider is registered.      
      System.Web.Hosting.HostingEnvironment.RegisterVirtualPathProvider(new IdeaBlade.EntityModel.Web.ServiceVirtualPathProvider());     
    }			
</script>

If you move this code in the file Global.asax.cs the polling will makes the devforce's services lags.