Sorting a GridView Bound to a Custom Data Object

This article presents a technique for sorting a GridView populated from a list of custom data objects. It relies on the view state and does not require additional calls to the database.

http://www.eggheadcafe.com/tutorials/aspnet/e07f0f1a-4243-4050-8278-00d32b2e5121/aspnet--sorting-a-gridv.aspx