What is XDocument? [closed]

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I am using linq to xml.

In this we load xml file as XDocument.Load("filename.xml").

What is this XDocument?

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XDocument is a .NET class which represents an XML Document in memory but with specific support for Linq. It is part of the System.Xml.Linq namespace. See msdn.

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XDocument is a class representing an XML document, providing LINQ-friendly behaviors and approaches.

It's System.Xml.XmlDocument equivalent for the LINQ era.

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In your case XDocument is a class which allows you to call the static method Load.
This Load method returns an instance of XDocument.