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<An Introduction to LINQ - Part 3 ⁄ >

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In the previous installment of this series on LINQ, you learned the basics of DLINQ and saw how to use it to retrieve data from the database. Specifically it focused on the retreival of relational data for display purposes. This installment will shift gears and focus on the XML aspects of LINQ, known as XLINQ. To start with, you will learn the basics of XLINQ (XML Query extensions of LINQ) and then we'll discuss the steps involved in using DLINQ in conjunction with XLINQ to retrieve, transform, and display data. Along the way, you will also see the ways in which you can convert relational data to hierachical data using XLINQ's functional construction capabilities. Finally you will learn the steps involved in implementing complex data binding with hierarchical data generated through XLINQ.

Introduction to XLINQ

XLINQ is a new in-memory XML programming API targeted at querying XML data using the standard query operators supplied with LINQ. XLINQ provides both DOM and XQuery/XPath like functionality in a consistent programming experience across the different LINQ-enabled data access technologies. There are two important characteristics of XLINQ. First, as a member of the LINQ family of technologies, XLINQ provides a consistent query experience for querying XML data. Second, XLINQ exposes DOM functionalities in addition to supporting some of the XPath and XSLT features.

All of the XLINQ related functionalities are exposed through the classes present in the System.Xml.XLinq namespace. The below table provides an overview of the key classes contained in the System.Xml.XLinq namespace.

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