Getting values from ListView

Question

Hi,
I have a products page which has ListView control taking data from ObjectDataSource. This LisView shows sub product list with product code, name and price. And each line in ListView has a button to add these products to a list.

When I click to one of these buttons, on button_click event, I would like to get the product id of clicked row. And I wonder what is the easiest way to do that?

Thank you.