The LINQ documentation created by Microsoft is available both inside Visual Studio, and for free via the MSDN library found on the WEB. Here are some important pages from that documentation that can help you navigate through the online reference material that Microsoft has prepared for LINQ developers. I would not suggest using these references materials as a primary means of learning LINQ. However, if you have a book or other guide to LINQ development, then this reference material can be a useful addendum to that text. If you understand in a general way how LINQ works, but need answers to detailed questions, the links provided here may sometimes help you find answers to your questions.