XML VB.Net

Imports System
Imports System.IO
Imports System.Xml
Public Class Sample 
  Public Shared Sub Main() 
     Dim writer As XmlWriter = Nothing
     writer = XmlWriter.Create("sampledata.xml")
     writer.WriteStartElement("book")
     writer.WriteAttributeString("xmlns","bk", Nothing,"urn:book")
     writer.WriteAttributeString("ISBN", "urn:book", "1-111111-925")
     writer.WriteElementString("price", "9.9")
     writer.WriteEndElement()
     writer.Flush()
     writer.Close()  
  End Sub
End Class