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Source Code

The LinqToSqlCrud example can be found under the Chapter 24 subdirectory.

Manipulating XML Documents Using LINQ to XML

The final section of this chapter is to introduce you to the role of LINQ to XML, which as you recall

allows you to apply LINQ query expressions against XML documents. Although this edition of this

book does not provide a chapter solely dedicated to programming with .NET’s XML APIs, by now

you have probably picked up on the fact of how deeply XML data representation has been inte-

grated into the .NET Framework.

Application and web-based configuration files store data as XML. ADO.NET DataSets can easily

save out (or load in) data as XML. Windows Presentation Foundation makes use of an XML-based

grammar (XAML) to represent desktop UIs and Windows Communication Foundation (as well as the

original .NET remoting APIs) also store numerous settings as the well-formatted string we call XML.

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Although XML is indeed everywhere, programming with XML has historically been very

tedious, very verbose, and very complex if one is not well versed in a great number of XML tech-

nologies (XPath, XQuery, XSLT, DOM, SAX, etc.). Since the inception of the .NET platform, Microsoft

has provided a specific assembly devoted to programming with XML documents named System.

Xml.dll. Within this binary are a number of namespaces and types to various XML programming

techniques, as well as a few .NET-specific XML APIs such as the XmlReader/XmlWriter models.