I just had an article published in the June issue of Visual Studio magazine.
http://www.visualstudiomagazine.com
This is my first time in “print”! The direct link to my article is:
https://visualstudiomagazine.com/Articles/2006/06/01/Validate-Business-Objects-Declaratively.aspx
A couple of people had trouble downloading the code from the VSM site so I'm happy to provide directly. The article essentially presents a flexible framework for validating business objects utilizing attributes.