Silverlight 4: Creating an Application to Play Offline Media

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.IO;

namespace OfflineVideos.UI
{
    public partial class MainAppView : UserControl
    {
        public MainAppView()
        {
            InitializeComponent();
            Loaded += new RoutedEventHandler(MainAppView_Loaded);
        }

        void MainAppView_Loaded(object sender, RoutedEventArgs e)
        {
            Button_Click(null, null);
        }

        private void Button_Click(object sender, RoutedEventArgs e)
        {
            var ofd = new OpenFileDialog();
            ofd.Filter = "Media Files |*.wmv;*.wma;*.mp3";
            ofd.Multiselect = false;
            if((bool)ofd.ShowDialog())
            {
                if(File.Exists(ofd.File.FullName))
                {
                    LoadMedia(ofd.File.OpenRead());
                }
            }
        }

        void LoadMedia(Stream file)
        {
            player.SetSource(file);
        }
    }
}