Timer, Progressbar in Silverlight

public Page()  
{  
    InitializeComponent();  
 
    System.Windows.Threading.DispatcherTimer myDispatcherTimer = new System.Windows.Threading.DispatcherTimer();  
    myDispatcherTimer.Interval = new TimeSpan(0, 0, 0, 0, 100); // 100 Milliseconds  
    myDispatcherTimer.Tick += new EventHandler(Each_Tick);  
    myDispatcherTimer.Start();  
}  
 
// Fires every 100 miliseconds while the DispatcherTimer is active.  
public void Each_Tick(object o, EventArgs sender)  
{  
    MediaProgress.Value = media.Position.TotalSeconds;  
}  
private void Play_Click(object sender, RoutedEventArgs e)  
{  
    media.Play();  
    MediaProgress.Maximum = media.NaturalDuration.TimeSpan.TotalSeconds;  
    //media.Position;  
}  
 
private void pause_Click(object sender, RoutedEventArgs e)  
{  
    media.Pause();  
}