At
http://shop.oreilly.com/category/deals/csharp.do?code=WKCSHR&imm_mid=0b0077&cmp=em-prog-books-videos-lp-owo_csharp_direct_wkcshr, O'Reilly are 50% off C# E-Books until 25/Sept/2013 17:00 PT.
There is a further list of these books at
http://shop.oreilly.com/category/browse-subjects/programming/csharp.do .
Here are just a few of the highlights of the many books on offer. The first book is the latest edition of the book I used to learn C# with back in 2004.
I read the previous edition of this book and I am currently reading this edition. I will be writing a formal review of it due course. I recommend it to anyone with 12-18 months or more of C# development experience.
This book is from the Head First series of books and they provide an excellent way of learning a topic.
I have read this book and will be writing a review shortly. For now, I will just say that it is an excellent focused read on this topic.