Access Named Child Elements Using the Elements Method in CSharp

//from  w ww.  j  av  a2s.  c o m

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 XDeclaration("1.0", "UTF-8", "yes"),
       new XDocumentType("Books", null, "Books.dtd", null),
       new XProcessingInstruction("Book", "out-of-print"),
       new XElement("Books", firstParticipant =
       new XElement("Book",
       new XComment("a new author."),
       new XProcessingInstruction("AuthorHandler", "new"),
       new XAttribute("type", "Author"),
       new XElement("FirstName", "J"),
       new XElement("LastName", "R")),
       new XElement("Book",
       new XAttribute("type", "Author"),
       new XElement("FirstName", "E"),
       new XElement("LastName", "B"))));
        foreach (XNode node in firstParticipant.Elements("FirstName")) {
            Console.WriteLine(node);
        }
    }
}