Example
private bool navigateFlag = false;
protected async override void OnNavigatingFrom(NavigatingCancelEventArgs e)
{
base.OnNavigatingFrom(e);
if (!navigateFlag)
{
e.Cancel = true;
var dialog = new MessageDialog("Navigate away?", Confir,);
dialog.Commands.Add(new UICommand("Yes", null, 0));
dialog.Commands.Add(new UICommand("No", null, 1);
dialog.CancelCommandIndex = 1;
dialog.DefaultCommandIndex = 0;
var result = await dialog.ShowAsync();
if (Convert.ToInt16(result.Id) != 1)
{
navigateFlag= true;
this.Frame.Navigate(e.SourcePageType);
}
}
}
