I was reading the Andrew Troelsen book and I found this interesting picture regarding the C# Data Type Class Hierarchy.

Before learning C#, I was working with C/C++ language for control engineering after this job I moved to Java programming and one of my friends in 2004 lent me a book for C# language, since then I am a fan of this language because when you learn c# language you are learning three programming languages (C/C++, Java and C#). It is really amazing to see how they are  so similar.