C# in Depth, Fourth Edition, Skeet John
C# in Depth is a book for those who are passionate about C#. It aims to be a bridge between the existing introductory books and the language specification: something readable but detailed, exploring every aspect of the language from version 2 onwards. In the interests of brevity, it doesn't spend much time on C# 1 - readers are already expected to know the first version at least reasonably. Every new feature from C# 2 onwards is covered, however, as shown in the table of contents below.