how to disable form1 on a button click event of form2 which loads as a dialog box on top of form1

Hi,

I am a newbie in c# windows forms and I have 2 forms here form 1 and form 2. Form2 loads as a dialog box from form1 and form2 has 2 buttons OK and CANCEL. on clicking cancel button I want the controls in the form2 to get disabled. Please help me out.

Thanks in advance.