ApplicationBar.MainPage.appBarOpacity_Clicked C# (CSharp) Method

        private void appBarOpacity_Clicked(object sender, RoutedEventArgs e)
        {
            var checkBox = (CheckBox)sender;
            if (checkBox.IsChecked.Value)
                ApplicationBar.Opacity = 0.5;
            else
                ApplicationBar.Opacity = 1.0;
        }