Create XDocument from XDeclaration,XDocumentType,XProcessingInstruction and XElement in CSharp

using System;/*from   w  w w .  j a va 2  s. c  om*/
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 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"))));

        Console.WriteLine(firstParticipant.Document);
    }
}