Is there any difference between using Invoke for the parent form or for the target control?

These two have the same effect. You can assume the form and the control were created on the same thread.

1 Technically it is possible for this not to be the case. Very rare, but Windows does support pinvoking SetParent() to break that rule. Adobe Acrobat Reader does this for example.

The AxHost wrapper for it is however still associated with the UI thread. Winforms will fight you tooth and nail to stop you from doing this. You can win.

– Hans Passant Nov 11 '10 at 15:40.

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