void DownloadCenterForm_FormClosing(object sender, FormClosingEventArgs e)
        {
            if (!trayIconExit)
            {
                e.Cancel = true;
                Hide();
                notifyIcon1.Visible = true;
                return;
            }

            if (MTDOList.Any(x => x.dorg.IsActive))
            {
                flagCloseAfterStop = true;
                e.Cancel           = true;
                foreach (var item in MTDOList)
                {
                    item.dorg.Stop();
                    item.dorg.Stopped += dorg_Stopped;
                }
            }
            else
            {
                saveDownloadList();
                notifyIcon1.Visible = false;
                notifyIcon1.Icon    = null;
                notifyIcon1.Dispose();
                notifyIcon1 = null;
            }
        }
        void dorg_Stopped(object sender, EventArgs e)
        {
            if (flagCloseAfterStop && !MTDOList.Any(x => x.dorg.IsActive) && trayIconExit)
            {
                flagCloseAfterStop = false;
                saveDownloadList();
                notifyIcon1.Visible = false;
                notifyIcon1.Icon    = null;
                notifyIcon1.Dispose();

                this.Close();
            }
        }