RSS Feed Reader in C# Express

They're built-in .NET classes.  XDocument is located in the namespace System.Xml.Linq, and XmlDocument is located in System.Xml.  In .NET 3.5, use XDocument.  In 2.0, use XmlDocument.  They're very different.  Searching for either on google will turn up the documentation on MSDN, which can give you more information on usage.

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