NetTuts.com has posted the next part in their series (the looking at the SOLID development principles discussing the Dependency Inversion Principle, the final letter in the "SOLID" acronym.
It would be unjust to tell you that any one of the SOLID principles is more important than another. However, probably none of the others have such an immediate and profound effect on your code than the Dependency Inversion Principle, or DIP in short. If you find the other principles hard to grasp or apply, start with this one and apply the rest on code that already respects DIP.
They start off with a basic definition of the dependency inversion principle and an example of it in a more real world situation. They use it to separate out the handling of reading and rendering PDFs and eBooks. It's just some basic code, no real functionality, but it gives you an idea of how to architect the application.
Link: http://code.tutsplus.com/tutorials/solid-part-4-the-dependency-inversion-principle--net-36872
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