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Pro LINQ: Language Integrated Query in C# 2008 by Joseph C. Rattz Jr.

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Referenced Namespaces

To use the LINQ to DataSet operators, add a using directive to the top of your code for the System.Linq, and System.Data namespaces if they are not already there:

using System.Data;
using System.Linq;

This will allow your code to find the LINQ to DataSet operators.

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