class ControlHelper
    {
        public static void ShowOnTxtLbl<T>(T control, string mess)
             where T : System.Windows.Forms.Control, new()
        {
            if (control.InvokeRequired)
            {
                control.BeginInvoke(new MethodInvoker(delegate
                {
                  control.Text = mess;
                }));
            }
            else
            {
                control.Text = mess;
            }
        }
    }