I think question is itself explanatory. I am wondering how it is possible to write NUnit tests for such events. If you go deeper, it looks like using ASP.NET is not appropriate for writing unit tests.
Thoughts please ..
Edit The idea of this question is, if you have a grid view in your page and let's say you have gridview.rowcommand event subscribed on this control. And, you have some logic that is implemented based on the rowcommand event arguments. Now, how will you test this method using a unit testing framework?