Update a Node's Value in CSharp

 //from w ww  .  jav  a 2 s. c om

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);

    }
}