Problem playing WPF media file

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C#

hi i m trying to play media in wpf.code gives no error every thing seems to be ok but no media opens
below is the code i am trying please aboid to put any google link

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Windows;
using System.Windows.Controls;
using System.Windows.Data;
using System.Windows.Documents;
using System.Windows.Input;
using System.Windows.Media;
using System.Windows.Media.Imaging;
using System.Windows.Navigation;
using System.Windows.Shapes;

namespace WpfApplication1
{
    /// <summary>
    /// Interaction logic for MainWindow.xaml
    /// </summary>
    public partial class MainWindow : Window
    {
        public MainWindow()
        {
            InitializeComponent();
        }

        private void button1_Click(object sender, RoutedEventArgs e)
        {
            
            System.IO.Stream checkStream = null;
            Microsoft.Win32.OpenFileDialog dlg = new Microsoft.Win32.OpenFileDialog();           
            dlg.Filter = "All Supported File Types(*.mp3,*.wav,*.mpeg,*.wmv,*.avi)|*.mp3;*.wav;*.mpeg;*.wmv;*.avi";
            if ((bool)dlg.ShowDialog())
            {
                try
                {
                    if ((checkStream = dlg.OpenFile()) != null)
                    {
                        mediaElement1.Source = new Uri(dlg.FileName);
                    }
                }
                catch (Exception ex)
                {
                    MessageBox.Show("Error: Could not read file from disk. Original error: " + ex.Message);
                }
            }

        }

        private void button2_Click(object sender, RoutedEventArgs e)
        {
            mediaElement1.Play();
        }
    }
}