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Modifying Data in an XML Document

Finally, as you would hope, LINQ to XML provides numerous ways to insert, delete, copy, and

update XML content. Adding new XElements to an existing XElement (or XDocument) is no harder than

calling the Add() method, which adds the data to the end of the element/document. As an alterna-

tive, you can call AddFirst() to add the item to the top of the element/document or AddAfterThis()/

AddBeforeThis() to insert data at a specific location.

Updating or deleting content is also very straightforward. After constructing a LINQ query

statement to identify the item (or items) you wish to tinker with, simply call ReplaceContent() (for

updating) or Remove()/RemoveContent() (for deletion of data). By way of a simple example, consider

the following code, which adds a set of new  elements to the incoming XElement parameter:

static void AddNewElements(XElement doc)

{