Using DropDownLists in EditTemplate

[JDC]

Hi all,

I have a template column in a GridView, in which the EditTemplate
consists of three drop-down lists. When an item is chosen in the first
combo, I want the page to refresh and populate the second dropdown
based on what the user selects in the first. Then when a value is
chosen in the second dropdown, the page refreshed once again and
populates the third dropdown.

What's the best way to do this?

Cheers, JC