Adds the specified XmlAttribute.
using System; using System.IO; using System.Xml; public class Sample { public static void Main() { XmlDocument doc = new XmlDocument(); doc.LoadXml("<book xmlns:bk='urn:samples' bk:ISBN='1-111111-11-1'>" + "<title>C#</title>" + "</book>"); XmlElement root = doc.DocumentElement; XmlAttribute attr = root.SetAttributeNode("genre", "urn:samples"); attr.Value="novel"; Console.WriteLine(doc.InnerXml); } }