XmlDocument.CreateComment creates an XmlComment containing the specified data.
Option Explicit Option Strict Imports System Imports System.IO Imports System.Xml Public Class Sample Public Shared Sub Main() Dim doc As New XmlDocument() doc.LoadXml("<book genre='Computer' ISBN='1-111111-57-5'>" & _ "<title>C#</title>" & _ "</book>") Dim newComment As XmlComment newComment = doc.CreateComment("Sample XML document") Dim root As XmlElement = doc.DocumentElement doc.InsertBefore(newComment, root) doc.Save(Console.Out) End Sub 'Main End Class 'Sample