async void DoRestartRequest(string text)
{
    AppRestartFailureReason result =
        await CoreApplication.RequestRestartAsync(text);

    if (result == AppRestartFailureReason.NotInForeground ||
        result == AppRestartFailureReason.RestartPending ||
        result == AppRestartFailureReason.Other)
    {
       Debug.WriteLine(«RequestRestartAsync failed: {0}», result);
    }
}