Language-Integrated Query (LINQ) is a general-purpose query facility included in the .NET 3.5 Framework that applies to all sources of information. In these video training sessions learn how LINQ extends languages like C# and Visual Basic with native language syntax for queries and provides class libraries to take advantage of these capabilities.
How Do I: Use Linq With Files
Overview of LINQ to XML
How Do I: Get Started with LINQ?
How Do I: LINQ over DataSets?