Adding a Node in the Specified Node's Child Nodes with AddBeforeSelf
using System; using System.Linq; using System.Xml.Linq; using System.Collections.Generic; class Program/*from ww w . j a v a 2 s .co m*/ { static void Main(string[] args){ // A document with one book participant. XDocument xDocument = new XDocument( new XElement("Books", new XElement("Book", new XAttribute("type", "Author"), new XElement("FirstName", "Joe"), new XElement("LastName", "Ruby")))); xDocument.Element("Books").Add( new XElement("Book", new XAttribute("type", "Editor"), new XElement("FirstName", "PHP"), new XElement("LastName", "Python"))); xDocument.Element("Books"). Elements("Book"). Where(e => ((string)e.Element("FirstName")) == "PHP"). Single<XElement>().AddBeforeSelf( new XElement("Book", new XAttribute("type", "Technical Reviewer"), new XElement("FirstName", "Fabio"), new XElement("LastName", "Ferracchiati"))); Console.WriteLine(xDocument); } }