Transferring values between parent and child forms

Question

Dear Sir/Mam

I have two form form1 and form2. on form1 when i press f4 button form2 opens with certain records on datagridview. On clicking of any row of the datagridview that should be filled in form1 textbox after closing the form2. How can i do it? Plz help me soonly.

Thanks 

Sanjay Gupta