CuttingEdge.Conditions is a library that helps developers to write fluent pre and postcondition validations in their C# 3.0 and VB.NET 9.0 code base. Writing these validations is easy and it improves the readability and maintainability of code.

The Helper Trinity is a set of helper classes applicable to most any .NET application. Using the classes in this library, you can much more easily validate arguments, raise events, and throw exceptions. Online at http://thehelpertrinity.codeplex.com/.