Help with adding a column to dataset or datagrid

Hello everyone

I have a application that displayes products from my inventory table in the datagrid. I use a dataadapter to fill the dataset. Now every thing is fine but I want to add another column (say Row no.), which starts with value 1 and increment its value by one every time another row is added in dataset. Is there a way to do this. Any help would be appriciated.

Thanks