Learning from Microsoft Shared Source

Microsoft has recently revamped what was previously their Reference Source Code Center to be simply Reference Source. This is a site for .NET developers who are interested in viewing the source code for the platform API’s, and like the Java OpenJDK this provides a wealth of learning opportunities for .NET. While I have spent only a few hours going through some of the code, there are definitely some common themes that are worth noting and at the top of my list is design by contract.
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After the software development lifecycle, programs experience certain evolutionary transitions. There is the moment of genesis when the initial application demonstrates capabilities in a proof of concept, but that is ultimately superceded by a succession of modifications that eventually jeopardizes the maintainability of that code.