how to insert combobox selected item into the datagridview particular cell?

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WinForms

Hi,
I have 2 textboxes and one Combo Box and DataGridView(DGV) in my Windows Form Application.In combo box there is 2 items ie., C and D.Like wise in my DGV i have 4 columns id,name,Credit and Debit.When I insert 'C' from Combo Box the Credit column should show as 'C' and the Debit column should show as null value.
Is it possible to insert like that.If possible please say how it is?
Thank You.