using System; using System.Linq; using System.Collections; using System.Collections.Generic; using System.Xml; using System.Xml.Linq; public class MainClass { public static void Main() { XElement firstParticipant; XDocument xDocument = new XDocument( new XElement("Books", firstParticipant = new XElement("Book", new XComment("This is a new author."), new XAttribute("type", "Author"), new XElement("FirstName", "J"), new XElement("LastName", "R")))); Console.WriteLine(xDocument); firstParticipant.Element("FirstName").Value = "J"; firstParticipant.Nodes().OfType<XComment>().Single().Value ="LINQ"; ((XElement)firstParticipant.Element("FirstName").NextNode).Nodes().OfType<XText>().Single().Value = "R"; Console.WriteLine(xDocument); } }