Running a windows form in a separate thread

Question

I am dealing with running a control in a form, however the form itself is of no value to me. I essentially want the form to run a task and return a value, however for that I

Answer 1

I've got two ideas in my mind:

1. Run delegate method

   IAsyncResult ar = del.BeginInvoke(callback, state);

   ... do the task

   EndInvoke(ar); // waiting for task result if you allow to wait

2. Separate thread

The best way may be use separate thread to do the task and call delegate in this thread to inform main thread about work finish.

edit: or Worker like suggest my predecessor