I tend to caution against such tight binding of one form to another.
Beyond subscribing to an event, the two should know nothing of each other.
How do I get my Form2 to react to something on my Form1?
How do I make my Form1 control something on my Form2?
Although you can have Form1 directly access items on Form2 it isn't the recommended way to go. It ties the two forms tightly to each other. If a change is made in Form2 such as removing one of the controls, then code in Form1 breaks.
It is better to Form1 raise an event, and have Form2 contain its own code for how to react to this. This places responsibility for Form2 within Form2, and Form1 within Form1.
It keeps Form1 blissfully ignorant of Form2 - and a logging component - and a progress component, and a dozen other little black boxes that can be subscribed to events in Form1, all without Form1 being made responsible for directly affecting controls other than itself.
Events tutorial (including Form to Form which is the same as class to class) This tutorial for a cash register does exactly that: It makes a virtual numeric keyboard. 
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