Extension method to update controls in a MultiThreaded WinForm application.

public static void ThreadSafeCall(this Control control, MethodInvoker method)
 {
     if (control.InvokeRequired)
     {
         try
         {
             control.Invoke(method);
         }
         catch (Exception ex)
         {
             MessageBox.Show(ex.ToString());
         }
     }
     else
     {
         method.Invoke();
     }
 }

txtOutput.ThreadSafeCall((MethodInvoker)delegate { txtOutput.Text = "Updated"; });