System.Xml.XPath.XPathNavigator.AppendChildElement C# (CSharp) Method

        public virtual void AppendChildElement(string prefix, string localName, string namespaceURI, string value)
        {
            XmlWriter writer = AppendChild();
            writer.WriteStartElement(prefix, localName, namespaceURI);
            if (value != null)
            {
                writer.WriteString(value);
            }
            writer.WriteEndElement();
            writer.Close();
        }

		public XPathNavigator AppendElement(string name, string namespaceUri, XPathNavigator source)
		{
			namespaceUri = GetEffectiveNamespace(namespaceUri);
			source.AppendChildElement(LookupPrefix(namespaceUri), name, namespaceUri, "");
			return source.SelectSingleNode("*[position()=last()]");
		}