I’m keeping all the 3rd party assemblies that I use in my .NET projects in a separate library folder called lib. It is a part of my Subversion repository. In most of my project it is placed in linked repository (with svn:externals property). It lets my check out the whole project on any machine I like and it compiles right away. But be aware! In such scenario (and, well… in any other scenario as well) you have to keep your lib up to date. Take a look at this nasty bug. I was using the NUnit version 2.4.6.0 Take a look at this test method: [NUnit.Framework.Test] public void Test() {…