private async void AddTodoButton_Click(object sender, RoutedEventArgs e) { (sender as Button).IsEnabled = false; try { MainPage.Current.TodoList.Add(_sourceFeed); AddTodoButton.Visibility = Visibility.Collapsed; RemoveTodoButton.Visibility = Visibility.Visible; new PopupToast(AppTools.GetReswLanguage("Tip_AddTodoListSuccess")).ShowPopup(); await IOTools.AddTodoRead(_sourceFeed); } catch (Exception ex) { new PopupToast(ex.Message, AppTools.GetThemeSolidColorBrush(ColorType.ErrorColor)).ShowPopup(); } (sender as Button).IsEnabled = true; }