private void StartProgressViewer()
 {
     pvw = new ProgressViewer();
     MD5ProgressThread      = new Thread(new ThreadStart(ShowProgressViewer));
     MD5ProgressThread.Name = "View ProgressBar";
     MD5ProgressThread.Start();
 }
 private void ShowProgressViewer()
 {
     pvw.ShowDialog(this);
     pvw = null;
 }