The purpose of the .NET ESAPI is to provide a simple interface that provides all the ordinary security functions a developer is likely to need in a clear, consistent, and easy to use way.

The .NET ESAPI architecture is very simple, just a collection of classes that encapsulate the key security operations most applications need.

Please see the OWASP ESAPI page for more details: http://www.owasp.org/index.php/ESAPI

API docs are available on my personal site: http://alexsmolen.com/dotnetesapidoc/index.html