Description:Without a doubt, O'Reilly Media produces many of the finest information technology books on the market. Whether your need is beginner's level introductions to information technologies or are a more advanced programmer in need of more complex and refined topics, O'Reilly has a book that can meet diverse needs of an audience often with vastly wide-ranging skill levels. One of their numerous series of books are the Nutshell series which their website describes as "topical quick-reference guides that document every nook and cranny of a topic or technology area . . . Designed to be daily companions, these books belong next to your keyboard, at the ready when you need a quick answer" ([...]). Having used a couple of the Nutshell selections for a couple of years, I have to say that this description perfectly fits these books. They are not really a book you sit and read cover to cover.The text contains twenty-six chapters covering all elements of C# 4.0 (a table of contents is available at [...]). However, the book covers "features new to C# 4.0 and the associated Framework are flagged so that you can also use this book as a C# 3.0 reference" (Albahari