xml 创建文件

   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");