private void listBox1_MouseDoubleClick(object sender, MouseEventArgs e)
{
    TaskbarManager.Instance.SetProgressState(TaskbarProgressBarState.Normal);
    axWindowsMediaPlayer1.Ctlcontrols.play();
    axWindowsMediaPlayer1.Ctlcontrols.currentItem =
                axWindowsMediaPlayer1.currentPlaylist.Item[listBox1.SelectedIndex];
    backgroundWorker2.RunWorkerAsync();
}

private void backgroundWorker2_DoWork(object sender, DoWorkEventArgs e)
{
    double val = 100*axWindowsMediaPlayer1.Ctlcontrols.currentPosition/axWindowsMediaPlayer1.currentMedia.duration;
    TaskbarManager.Instance.SetProgressValue((int)val,100);
}