private void OnBtn_Click(object sender, EventArgs e)
        {
            listBox1.Items.Clear();

            if (aPlaylistBox.Text == "")
            {
                MessageBox.Show("Invalid Playlist Id");
            }

            else
            {
                string playListId = aPlaylistBox.Text;

                _videos = _youtube.GetPlaylistVideos(playListId).ToArray();

                webBrowser1.Navigate(YoutubeApiWrapper.GetVideoEmbedHtml(_videos[0].Id));
                listBox1.Items.AddRange(_videos.Select(v => v.Title).Cast <object>().ToArray());
            }
        }
 private void PlayPreviousVideo()
 {
     webBrowser1.Navigate(YoutubeApiWrapper.GetVideoEmbedHtml(_videos[--_actualVideoId].Id));
 }
 private void playBtn_Click(object sender, EventArgs e)
 {
     webBrowser1.Navigate(YoutubeApiWrapper.GetVideoEmbedHtml(_videos[listBox1.SelectedIndex].Id));
 }