private void Form1_FormClosing(object sender, FormClosingEventArgs e)
        {
            isClosing = true;
            this.Hide();

            smng.RemoveAll <string>(SettingsConstants.URL);
            var lineQuery = queueingUrls.Lines
                            .SkipWhile(x => string.IsNullOrEmpty(x))
                            .Reverse()
                            .SkipWhile(x => string.IsNullOrEmpty(x))
                            .Reverse();

            foreach (string line in lineQuery)
            {
                smng.AddItem(SettingsConstants.URL, line);
            }

            pollingTimer.Stop();
            if (downloadWorker.IsBusy)
            {
                smng.AddItem(SettingsConstants.URL, downloadWorker.WatchUrl);
                SaveSettings();
                downloadWorker.CancelAsync();
            }
            else
            {
                SaveSettings();
            }
            while (downloadWorker.IsBusy)
            {
                Thread.Sleep(1 * 1000);
            }

            logWriter.Dispose();
        }