Alex Homer on Using the Enterprise Library Validation Application Block in ASP.NET

This is a nice article on Using the Validation Application Block in ASP.NET.

Summary from the site:

This article shows how you can take advantage of the validation features within the Validation Application Block, part of version 3.0 of Enterprise Library, in your ASP.NET applications. The block supports both UI and object validation, and you can combine these approaches using the same rules if you wish. The ability to validate objects is particularly useful when working with instances that may be generated locally, exposed by other tiers of your application, or received from a remote Web Service.