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Pro Clear and concise reference book for C#
"C# 5.0 in a Nutshell: The Definitive Reference" has an impressive index, making everything quick to find despite it's size (over 1000 pages). Concepts are explained clearly and in-depth.
Con Lack of context
This book is not designed as a tutorial, but as a reference only. For someone who hasn't yet been introduced to C#, "C# 5.0 in a Nutshell: The Definitive Reference" is going to be hard to follow.