How to use more than one DataKeyNames of a GridView in asp.net 2.0 / 3.5

In my previous article i have described "how we can remove multiple GridView rows like gmail deletion at a time". This article is the continution article. In this article i will modify the base article class file to show you how one can use more than one datakeynames in a gridview as well as in editing time or in GridView manipulation time how one can read more than one datakeynames that you have