private void ButtonGetAllplaylists_Click(object sender, EventArgs e)
        {
            string temp;

            labelCurrentPlaylist.Visible = true;
            labelCurrentPlaylist.Text    = "Waiting for user's data...";

            if (!ExcelHandling.ObtainExcelFile())
            {
                ExitForm();
            }

            listBoxPlaylists.Items.Clear();

            string channelID = textBoxChannelID.Text;

            YouTubePlaylist[] playLists = YouTubeAPI.GetPlaylists(channelID);

            playLists = playLists.OrderBy(c => c.title).ToArray();
            for (int i = 0; i < playLists.Length; i++)
            {
                listBoxPlaylists.Items.Add((i + 1).ToString() + ": " + playLists[i].title);
            }

            progressBarDownloadRate.Maximum = playLists.Length - 1;
            progressBarDownloadRate.Minimum = 0;
            progressBarDownloadRate.Step    = 1;
            for (int i = 0; i < playLists.Length; i++)
            {
                temp = listBoxPlaylists.Items[i].ToString() + " - SAVED";
                GetPlaylistData(playLists[i]);
                progressBarDownloadRate.Value = i;
                listBoxPlaylists.Items[i]     = temp;
            }

            if (myMissingVideos.Count() == 0)
            {
                MessageBox.Show("No missing videos at all playlists");
                ExcelHandling.CloseFile();
            }
            else
            {
                ExcelHandling.SaveMissingVideos(myMissingVideos);
                myMissingVideos.Clear();
                MessageBox.Show("Process finished successfully.\n" +
                                "A list of the Missing videos from all playlists appear at the last worksheet of the file");
            }
        }