public void SetMediaPlayerVolumeTest()
        {
            var playControlViewModel = new PlayControlViewModel();

            Assert.AreEqual(100, playControlViewModel.SliderVolumeValue);
            playControlViewModel.SetMediaPlayerVolume(70);
            Assert.AreEqual(70, playControlViewModel.SliderVolumeValue);
            Assert.AreEqual(70, playControlViewModel.mediaPlayer.Volume * 100);
        }
 private void Slider_ValueChanged(object sender, RoutedPropertyChangedEventArgs <double> e)
 {
     playControlViewModel.SetMediaPlayerVolume(e.NewValue);
     playControlViewModel.SaveVolumeSetting(e.NewValue);
 }