XML VB.Net

Imports System
Imports System.Xml
Imports System.Xml.XPath
Public Class MainClass
    Public Shared Sub Main()
        
        Dim document As XmlDocument = New XmlDocument()
        document.Load("domainBooks.xml")
        Dim navigator As XPathNavigator = document.CreateNavigator()
        
        navigator.MoveToChild("bookstore", "http://www.domain.com/books")
        navigator.MoveToChild("book", "http://www.domain.com/books")
        navigator.MoveToChild("price", "http://www.domain.com/books")
        
        Dim pages As XmlWriter = navigator.InsertBefore()
        pages.WriteElementString("pages", "100")
        pages.Close()
        
        navigator.MoveToParent()
        Console.WriteLine(navigator.OuterXml)
    End Sub
End Class