private void SendFeedBack() { if (Email != null && ItemChoose != "Selectionner une categorie" && Object != null && Comment != null) { var post = new HttpRequestPost(); var res = post.Feedback(Email, ItemChoose, Object, Comment); res.ContinueWith(delegate(Task<string> tmp2) { var result = tmp2.Result; if (result != null) { CoreApplication.MainView.CoreWindow.Dispatcher.RunAsync(CoreDispatcherPriority.Normal, AgileCallback); } }); } else { var loader = new ResourceLoader(); new MessageDialog(loader.GetString("ErrorAbout")).ShowAsync(); } }