Multiple Edit Buttons in Gridview

Hi,

I have two editbuttons in my gridview, I my form template I have 4 dropdowns.

When I click add new record button all the 4 dropdowns controls should be enable to add a record.

when I click the edit button 1 (Command name is EditEmp)  dropdown 1 & dropdown 2 should be enabled and dropdown 3 & dropdown 4 should be disabled to update the record

when I click the edit button 2 (Command name is EditDependent) on the same grid dropdown 1 & dropdown 2 should be disabled and dropdown 3 & dropdown 4 should be enabled to update the record.

Kindly let me know on which event I will do this changes.

thanks,

Ganeshkumar