Propagating events from one Form to another Form in C#

Question

How can I click a Button in one form and update text in a TextBox in another form?

Answer 1

Roughly; the one form must have a reference to some underlying object holding the text; this object should fire an event on the update of the text; the TextBox in another form should have a delegate subscribing to that event, which will discover that the underlying text has changed; once the TextBox delegate has been informed, the TextBox should query the underlying object for the new value of the text, and update the TextBox with the new text.