XmlDocument xmlDoc = new XmlDocument();            

            XmlNode xmlNode = xmlDoc.CreateNode(XmlNodeType.XmlDeclaration, "", "");

            xmlDoc.AppendChild(xmlNode);

            //加入根元素

            XmlElement xmlElem = xmlDoc.CreateElement("", "ROOT", "");        

            //xmlElem.SetAttribute("color", "red");

            //xmlElem.InnerText = "根结点";    

            xmlDoc.AppendChild(xmlElem);

            XmlElement xmlelem_c = xmlDoc.CreateElement("FIRST");

            xmlelem_c.SetAttribute("noe", "First nod");

            xmlelem_c.InnerText = "第1节点";

            xmlElem.AppendChild(xmlelem_c);

            

            xmlDoc.Save("d:\\t.xml");