This part builds the OO foundation for programming in C#. In the following chapters, I have made comparisons between how both C# and Java fulfill their support for object-oriented programming. This part has been written with the assumption that you are a Java developer. Hence I will not go through basic OO concepts and those 'why' questions (such as 'why do we want abstract methods?'; 'why are interfaces good?'; 'why do we need constants?'; etc.) but zoom in on the differences between the two languages.
I would suggest that you start with Chapter 5 which dissects the Hello World program you wrote in Chapter 4. The other chapters in this part can be read in any order. When you start on C# programming, you can always refer to the relevant sections for reference.
Language comparisons, in terms of their operators and flow control, will be covered in Part 3.
