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copied!<p>Linq is short for "Language integrated query." It's a set of language enhancements built into C# and VB. Basically, what you get is a bunch of standard query operators that can be applied to any IEnumerable of type T. There's a lot of different linq providers for specific types of data- for example, there's linq to xml, linq to entities, even linq to sharepoint. </p> <p>To get started with linq, in all its many forms, I suggest the book <a href="http://rads.stackoverflow.com/amzn/click/1590597893" rel="nofollow noreferrer">Pro Linq by Joseph C. Rattz.</a> It's an excellent overview of Linq. He takes a ground-up approach, first describing all the language features (like Lambda Expressions and Expression Trees) that Linq is built on, and then moving on to some standard linq provider implementations.</p> <p>Additionally, here's a pretty good MSDN article describing Linq: <a href="http://msdn.microsoft.com/en-us/library/bb308959.aspx" rel="nofollow noreferrer">LINQ: .NET Language-Integrated Query</a></p> <p>Now, Linq to Sql is a linq provider written specifically for SQL Server. Included in this provider is an OR/M, that gives you some handy-dandy functionality (like typing out all your sql tables, so you get a robust design-time view of your database schema.) It's totally awesome, and for me, has greatly speed up development time when working with a sql database. The book I recommended above also has a great section about using Linq To Sql. Also, here's a good "beginner's guide" article from MSDN: <a href="http://msdn.microsoft.com/en-us/library/bb425822.aspx#linqtosql_topic1" rel="nofollow noreferrer">Linq To SQL: .NET Language-Integrated Query for Relational Data</a></p>

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