Разработка простого медиа - плеера в среде Visual Studio 2010 используя Silverlight

using System;
using System.Collections.Generic;
using System.Linq;
using System.Net;
using System.Windows;
using System.Windows.Controls;
using System.Windows.Documents;
using System.Windows.Input;
using System.Windows.Media;
using System.Windows.Media.Animation;
using System.Windows.Shapes;
using System.Windows.Threading;
namespace mediaplayer
{
 
  public partial class MainPage : UserControl
  {
    DispatcherTimer VideoTimer;
    public MainPage()
    {
      InitializeComponent();
           
    }
       

    private void PlayButton_Click(object sender, RoutedEventArgs e)
    {
      if (mediaElement1.CurrentState == MediaElementState.Paused)
        {
          mediaElement1.Play();
        }
      else
        {
          mediaElement1.Position = new TimeSpan(0);
          mediaElement1.Play();
        }
    }

    private void PauseButton_Click(object sender, RoutedEventArgs e)
    {
      if (MediaElementState.Paused == mediaElement1.CurrentState)
        {
          mediaElement1.Play();
        }
      else
        {
          mediaElement1.Pause();
        }
    }

    private void StopButton_Click(object sender, RoutedEventArgs e)
    {
      mediaElement1.Stop();
    }

    private void VolumeSlider_ValueChanged
           (object sender, RoutedPropertyChangedEventArgs<double> e)
    {
      mediaElement1.Volume = VolumeSlider.Value;
    }

    private void UserControl_Loaded(object sender, RoutedEventArgs e)
    {
      VolumeSlider.Value = 1;
      VolumeSlider.Minimum = 0;
      VolumeSlider.Maximum = 1;

      PositionSlider.Value = 0;
      PositionSlider.Minimum = 0;
      PositionSlider.Maximum = 1;
      PositionSlider.LargeChange = 0.10;
      PositionSlider.SmallChange = 0.01;

          
      VideoTimer = new DispatcherTimer();
      VideoTimer.Interval = TimeSpan.FromMilliseconds(50);
      VideoTimer.Tick += new EventHandler(VideoTimer_Tick);
    }
 
    private void PositionSlider_MouseLeftButtonUp
           (object sender, MouseButtonEventArgs e)
    {
      mediaElement1.Position = TimeSpan.FromSeconds(Convert.ToInt64
        (PositionSlider.Value * mediaElement1.NaturalDuration.TimeSpan.TotalSeconds));
      Timer.Text = string.Format("{0:00}:{1:00}", 
        mediaElement1.Position.Minutes, mediaElement1.Position.Seconds);
      mediaElement1.Play();
    }

    private void PositionSlider_MouseLeftButtonDown
          (object sender, MouseButtonEventArgs e)
    {
      mediaElement1.Pause();
    }

    void VideoTimer_Tick(object sender, EventArgs e)
    {
      if (mediaElement1.NaturalDuration.TimeSpan.TotalSeconds > 0)
        {
          Timer.Text = string.Format("{0:00}:{1:00}",
              mediaElement1.Position.Minutes, mediaElement1.Position.Seconds);
          PositionSlider.Value = mediaElement1.Position.TotalSeconds / 
             mediaElement1.NaturalDuration.TimeSpan.TotalSeconds;
        }
    }
      
    private void mediaElement1_CurrentStateChanged(object sender, RoutedEventArgs e)
    {
      if (mediaElement1.CurrentState == MediaElementState.Playing)
        {
          VideoTimer.Start();
        }
      else
        {
          VideoTimer.Stop();
        }
    }
}
}