CLR is the heart of .NET framework, and we have reviewed some of the most important concepts behind its architecture, design, and implementation in order to better understand how our code works and how it can be analyzed in the search for possible problems.

So, overall, in this chapter, we saw an annotated (with commentaries, graphics, and diagrams) reminder of some important terms and concepts of computing that we will find within the book, and with this foundation, we went through a brief introduction to the motivations that rely on .NET framework's creation along with its fathers.

Next, we covered the what's inside CLR and how we can view it in action using tools provided by CLR itself and others available in Visual Studio 2015 from the Update 1.

The third point was a basic review of the complexity of algorithms, the Big O Notation and the way in which we can measure it in practice by testing some sorting methods implemented in C# in order to finish with a short list of the most relevant features the latest versions of .NET offer and that we will cover in different chapters of this book.

In the next chapter, we will dig into the substance of the C# language from the very beginning (don't miss Hejlsberg's true reasons for the creation of delegates) and how it has evolved to simplify and consolidate programming techniques with generics, lambda expressions, anonymous types, and the LINQ syntax.