public void Index()        {            //先创建XML,返回路径            XmlDocument xmldoc = new XmlDocument();            XmlDeclaration xmldecl;            xmldecl = xmldoc.CreateXmlDeclaration("1.0", "utf-8", null);            xmldoc.AppendChild(xmldecl);            //加入一个根元素            XmlNode xmlelem = xmldoc.CreateElement("", "place", "");            xmldoc.AppendChild(xmlelem);            XmlNode root = xmldoc.SelectSingleNode("place");            DataSet dsp = ServiceManager.UserBuyCarService.GetProvince();            foreach (DataRow item in dsp.Tables[0].Rows)            {                XmlElement xe1 = xmldoc.CreateElement("Province");//创建:省                 xe1.SetAttribute("code", item["provinceId"].ToString());                xe1.SetAttribute("name", item["provinceName"].ToString());                DataSet dscity = ServiceManager.UserBuyCarService.GetCity(item["provinceId"].ToString());                foreach (DataRow city in dscity.Tables[0].Rows)                {                    XmlElement xcity = xmldoc.CreateElement("city");//创建:市                    xcity.SetAttribute("code", city["cityId"].ToString());                    xcity.SetAttribute("name", city["cityName"].ToString());                    DataSet dscounty = ServiceManager.UserBuyCarService.GetCounty(city["cityId"].ToString());                    foreach (DataRow county in dscounty.Tables[0].Rows)                    {                        XmlElement xcounty = xmldoc.CreateElement("area");//创建:区                        xcounty.SetAttribute("code", county["countyId"].ToString());                        xcounty.SetAttribute("name", county["countyName"].ToString());                        xcity.AppendChild(xcounty);                    }                    xe1.AppendChild(xcity);                }                root.AppendChild(xe1);            }            //然后在保存到源位置            xmldoc.AppendChild(xmlelem);            //保存创建好的XML文档            string m_strFilePath = "E:\\汽配2014.12.22" + @"\City2.xml";            xmldoc.Save(m_strFilePath);        }