An implementation of Kent Beck's famous XUnit TestingFramework designed specifically for unit testing components written for the MicrosoftDotNet platform. 

'''v0.8.5 beta2''' was just released and is available for download at: http://sourceforge.net/projects/dotnetunit/

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See also NunitFramework.

Please note that these are two separate projects with differing approaches to creating UnitTest''''''s, so please be sure to check them both out.

Consider also HarnessIt, a vendor tool.  (But it won't be free.)

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CategoryDotNet 
CategoryTesting: TestingFramework for RegressionTesting of (MicrosoftDotNet) components and applications.