public static async Task SlideAndFadeOutToLeft(this Page page, float duration)
{
Storyboard storyboard = new Storyboard();
storyboard.AddVerticalSlideAnimation(0, -page.WindowWidth, duration);
storyboard.AddFadeEffectAnimation(1, 0, duration);
storyboard.Begin(page);
await Task.Delay((int)(1000 * duration));
}
public static async Task SlideAndFadeInFromRight(this Page page, float duration)
{
Storyboard storyboard = new Storyboard();
storyboard.AddVerticalSlideAnimation(page.WindowWidth, 0, duration);
storyboard.AddFadeEffectAnimation(0, 1, duration);
storyboard.Begin(page);
page.Visibility = Visibility.Visible;
await Task.Delay((int)(1000 * duration));
}