inserting cell values in DataGridView manually one at a time

Hi,

I am getting data from database into 3 separate components. These components are basically getting populated from separate sql queries.

I want the user to double click on one item per listbox, so that the item automatically populates respective cell of the datagridview.

Question is how can I add datagridview on cell by cell basis ( given there is some default data such as "N\A" or "Fill in", in there. Or even without the default data)

Could someone provide me with some sample code.

Thanks,

Raj