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This book is not primarily a reference. Instead, it is meant to explain how LINQ works, the structure of its architecture, and best practices for its use. However, a good reference can help supplement the materials found in this book and can help answer many common questions about LINQ.
The LINQ documentation created by Microsoft is primarily a reference document. It is available both inside Visual Studio and for free via the MSDN library found on the web. Here are some important pages that can help you navigate through the online LINQ documentation: