private void NotificationListener_NotificationChanged(UserNotificationListener sender, UserNotificationChangedEventArgs args) { switch (args.ChangeKind) { case UserNotificationChangedKind.Added: UserNotification notification = sender.GetNotification(args.UserNotificationId); if (notification != null && notification.AppInfo.AppUserModelId == WINDOWS_SYSTEM_TOAST_CALLING) { sender.RemoveNotification(notification.Id); } break; } }