XML C#

using System;
using System.Linq;
using System.Xml;
using System.Xml.Linq;
using System.Collections;
using System.Collections.Generic;
using System.Xml.XPath;
public class MainClass
{
    public static void Main()
    {
        XPathDocument document = new XPathDocument("domainBooks.xml");
        XPathNavigator navigator = document.CreateNavigator();
        navigator.MoveToChild("bookstore", "http://www.domain.com/books");
        navigator.MoveToChild("book", "http://www.domain.com/books");
        XPathNodeIterator bookDescendants = navigator.SelectDescendants("", "http://www.domain.com/books", false);
        while (bookDescendants.MoveNext())
        {
            Console.WriteLine(bookDescendants.Current.Name);
        }
        XPathNodeIterator bookChildren = navigator.SelectChildren("", "http://www.domain.com/books");
        while (bookChildren.MoveNext())
        {
            Console.WriteLine(bookChildren.Current.Name);
        }
        navigator.MoveToChild("title", "http://www.domain.com/books");
        XPathNodeIterator bookAncestors = navigator.SelectAncestors("", "http://www.domain.com/books", false);
        while (bookAncestors.MoveNext())
        {
            Console.WriteLine(bookAncestors.Current.Name);
        }
    }
}