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Using XPathNavigator to select single node

Public Class Example6     Shared Sub Main         Dim doc As System.Xml.XmlDocument         Dim editor As System.Xml.XPath.XPathNavigator         doc = New System.Xml.XmlDocument()         doc.Load("pubs.xml")         editor = doc.CreateNavigator.SelectSingleNode("/pubs/publishers[@pub_id='0736']/@pub_name")         editor.SetValue("new value")         doc.Save("output.xml")     End Sub End Class