Want to Complete knowledge of C#... from beginning to end

If you're just talking about the language itself, then check out this book which is 'complete' up to C# 4.0:

http://www.amazon.com/4-0-Complete-Reference-Herbert-Schildt/dp/007174116X

For C# 5.0, you'll also need to read the following book as 'async' is the only new feature of note but is very deep:

http://www.amazon.co.uk/Async-C-5-0-Alex-Davies/dp/1449337163