xml 만들기

XmlDocument doc = new XmlDocument();
                doc.LoadXml("<test></test>");

                XmlNode node = doc.DocumentElement.SelectSingleNode("test");

                XmlElement elem = doc.CreateElement("Root");
                elem.SetAttribute("id", "id다");
                elem.InnerText = "내용이다";

                node.AppendChild(elem);

                이렇게 하면 <test><root id="id다">내용이다</root></test>