Notification บน Window Store Apps (C#) / Win RT

public async static Task<bool> Notification(string nameContent, string nameDetail, string img)
{
            ToastNotification toastNotification;
            var notificationXml = ToastNotificationManager.GetTemplateContent(ToastTemplateType.ToastImageAndText03);
            var toeastElement = notificationXml.GetElementsByTagName("text");
            toeastElement[0].AppendChild(notificationXml.CreateTextNode(nameContent));
            toeastElement[1].AppendChild(notificationXml.CreateTextNode(nameDetail));

            var imageElement = notificationXml.GetElementsByTagName("image");
            imageElement[0].Attributes[1].NodeValue = img;
            toastNotification = new ToastNotification(notificationXml);

            ToastNotificationManager.CreateToastNotifier().Show(toastNotification);
            toastNotification.Dismissed += toast_Dismissed;
            toastNotification.Failed += toast_Failed;
            toastNotification.Activated += toast_click;
           
            return true;
}
        

await FunctionSQLite.Notification(not_name, not_cate, not_img);

private static void toast_click(ToastNotification sender, object args)
        {
            Debug.WriteLine("Event Click: click");
           // throw new NotImplementedException();
        }

        private static void toast_Failed(ToastNotification sender, ToastFailedEventArgs args)
        {
            Debug.WriteLine("Event Click: error");
           // throw new NotImplementedException();
        }

        private static void toast_Dismissed(ToastNotification sender, ToastDismissedEventArgs e)
        {
            if (e.Reason == ToastDismissalReason.UserCanceled)
            {
                Debug.WriteLine("Event Click: cancel");
            }
            else if (e.Reason == ToastDismissalReason.TimedOut)
            {
                Debug.WriteLine("Event Click: Timedout");
            }
            else if (e.Reason == ToastDismissalReason.ApplicationHidden)
            {
                Debug.WriteLine("Event Click: ApplicationHidden");
            }
        }