Opening and Closing windows forms

Question

I have 2 forms, form1 and form2. All I wanna do is open form2 from form1 (using a button on form1). Then close form1 so that just form2 is showing. I also want a button on form2 that will close the application. The above tasks are very easy in VB6 code - it seems a little tricky in C#. Anyone help/advise me? thanks