C# in Depth has become widely regarded as one of the best books in its field, focusing on C# as a language to provide an unparalleled level of detail. It explains not just what the language does, but also why it was designed that way. C# in Depth, Third Edition has been updated and expanded to cover the new features in C# 5, such as async modifier and async await operator which provide greater support for asynchronous operations and improve the ability to write asynchronous code which is readable, robust, and maintainable. It expertly guides the reader through the details and gives a new level of clarity about how the language works and how to use it most effectively. *Explains the what and why of C# * Covers new features of C# 5 * Shows how to avoid hidden pitfalls This book is aimed at intermediate to advanced developers who already know C# to some extent - but are possibly very rusty. C#, which is used to write asynchronous code, is a language primarily developed by Microsoft, targeting the .NET platform and is widely used in the corporate world. .NET 4.5 , released August 2012, supports C# 5 which is the next version of the language and contains features that make it much easier to write apps for Windows 8, which relies heavily on asynchrony.