How to write Unit testable code?

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The below article may be older, but it gives how to start your classes to make more unit testable.

http://www.asp.net/mvc/overview/older-versions-1/contact-manager/iteration-4-make-the-
application-loosely-coupled-cs

http://web.archive.org/web/20150318150744/http://www.remondo.net/repository-pattern-example-csharp/

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