The System.Linq namespace provides classes and interfaces that support queries that use Language-Integrated Query (LINQ).
The System.Linq namespace is in the System.Core assembly (in System.Core.dll).
The Enumerable class contains LINQ standard query operators that operate on objects that implement IEnumerable<T>.
The Queryable class contains LINQ standard query operators that operate on objects that implement IQueryable<T>.
For information about LINQ to SQL, see LINQ to SQL [LINQ to SQL].
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