Looks up the closest xmlns declaration for the given namespace URI
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='1-111111-57-5'>" +
"<title>C#</title>" +
"</book>");
XmlNode root = doc.FirstChild;
string prefix = root.GetPrefixOfNamespace("urn:samples");
XmlElement elem = doc.CreateElement(prefix, "style", "urn:samples");
elem.InnerText = "hardcover";
root.AppendChild(elem);
doc.Save(Console.Out);
}
}
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