/// <summary>
/// Invoked when application execution is being suspended. Application state is saved
/// without knowing whether the application will be terminated or resumed with the contents
/// of memory still intact.
/// </summary>
/// <param name="sender">The source of the suspend request.</param>
/// <param name="e">Details about the suspend request.</param>
private async void OnSuspending(object sender, SuspendingEventArgs e)
{
IPageNavigator pageNavigator = ServiceLocator.Instance.Resolve <IPageNavigator>();
var deferral = e.SuspendingOperation.GetDeferral();
await pageNavigator.SaveAsync();
deferral.Complete();
}
