Display uploading progress bar

Hi, 

I want to show uploading process at the time  of file uploading on web server, i have use following code :
 
 
  private void btnVideoupload_Click(object sender,
                                                 RoutedEventArgs e)
 {
 OpenFileDialog dlg = new OpenFileDialog();
        dlg.Multiselect = false;
        dlg.Filter = "Video Files (*.mp4)|*.mp4|Video Files (*.mpeg)|*.mpeg| Video Files (*.wmv)|*.wmv";
        dlg.FilterIndex = 1;
        bool? retval = dlg.ShowDialog();
        if (retval != null && retval == true)
        {
          txtVideoPath.Text = dlg.File.Name;  strmVideo1 =                 dlg.File.OpenRead();
    UploadVideo(dlg.File.Name, dlg.File.OpenRead());
        }
        else
        {
            txtVideoPath.Text = "No file selected...";
        }
  }
 
 

private void UploadVideo(string fileName, Stream data)
{
 if (strImagePath != "")
    {
   UriBuilder ub = new UriBuilder("http://www.demosite.com/       Video_Upload.ashx");
         ub.Query = string.Format("filename={0}", fileName);
        WebClient c = new WebClient();
        c.OpenWriteCompleted += (sender, e) =>
         {
   PushVideo(data, e.Result, fileName);
       e.Result.Close();
       data.Close();
    };
   c.OpenWriteAsync(ub.Uri);
      }
  }
 
 

private void PushVideo(Stream input,
                               Stream output,
                                String strFileName)        
{
 byte[] buffer = new byte[input.Length];
          int bytesRead;
         while ((bytesRead = input.Read(buffer, 0, buffer.Length)) != 0)
        {
         output.Write(buffer, 0, bytesRead);
        }
}