private void linkLabel2_LinkClicked(object sender, LinkLabelLinkClickedEventArgs e)
 {
     if (SendEvent != null)
     {
         SendEvent(this, null);
     }
     Gc();
     tcp.IsCancel = true;
     if (!tcp.IsSending)
     {
         Task.Run(() =>
         {
             tcp.SendCancel();
         });
     }
 }