What is Language Integrated Query (LINQ)?
Language Integrated Query (LINQ) adds the ability to query objects using .NET languages. The LINQ to SQL object/relational mapping (O/RM) framework provides the following basic features:
LINQ is a programming model that introduces queries as a first-class concept into any Microsoft .NET language. Complete support for LINQ, however, requires some extensions in the language you are using. These extensions boost developer productivity, thereby providing a shorter, more meaningful, and expressive syntax with which to manipulate data
