private void PlayButton_Click_2(object sender, RoutedEventArgs e)
 {
     if (playButton3.Content.ToString() == "Play")
     {
         Media3.Play(); playButton3.Content = "Pause";
     }
     else
     {
         Media3.Pause(); playButton3.Content = "Play";
     }
 }
 private void RestartButton_Click_2(object sender, RoutedEventArgs e)
 {
     Media3.Stop();
     Media3.Play();
 }
 private void StopButton_Click_2(object sender, RoutedEventArgs e)
 {
     playButton3.Content = "Play";
     Media3.Stop();
 }