select a gridview row and show details

[SteveInBeloit]

HI,
I have a gridview that is selectable with a button. Once you select a row, I need to grab a value out of that row, and use it to makes SELECTs to tables to populate other sections of the page.
1) how do I get just the value out of that row
2) how do I make a Select to tables and get several bits of info back to populate many textboxes. I know how to configure the datasouce and populate a gridview, but I need to populate many textboxes.

Thanks