asp.net讀寫xml

  //獲取合同信息
            string projectNo = Request.QueryString["projectNo"];

            string Sql="select * from tableName where projectNo='+projectNo+'";
            DAL.DALSelect xx = new DALSelect();
            SqlDataReader reader = xx.ExecuteReader(Sql);

            XmlDocument xmlDoc = new XmlDocument();
            xmlDoc.Load(Server.MapPath("/WebTest/DocumentManage/User.xml")); //xml文件路徑
            XmlNode xmldocSelect = xmlDoc.SelectSingleNode("User");//xml所有節點的父節點

            XmlNode root = xmlDoc.DocumentElement;
            root.RemoveAll(); //每次寫入xml文件的時候都清空原來所有的節點,避免重複的數據寫入xml文件

            while (reader.Read())
            {
                string ContractId = reader["ContractId"].ToString();
                string ContractType = reader["ContractType"].ToString();
                string PayMoneyNotId = reader["PayMoneyNotId"].ToString();
                string CustName = reader["CustName"].ToString();
                string PayMoney = reader["PayMoney"].ToString();
                string PayMoneyLimitT = reader["PayMoneyLimitT"].ToString();
                string PayMoneyLimitTUnit = reader["PayMoneyLimitTUnit"].ToString();
                string ContractName = reader["ContractName"].ToString();
                string ContractNo = reader["ContractNo"].ToString();
                string ContractStartT = reader["ContractStartT"].ToString();
                string ContractEndT = reader["ContractEndT"].ToString();
                string ContractRemarks = reader["ContractRemarks"].ToString();



                XmlElement el = xmlDoc.CreateElement("ContractInfo"); //添加ContractInfo節點
                el.SetAttribute("Id", PayMoneyNotId); //添加ContractInfo節點的屬性"Id"
                el.SetAttribute("Name", ContractName);   //添加ContractInfo節點的屬性 "ContractName"

                XmlElement xesub1 = xmlDoc.CreateElement("ContractType"); //添加ContractInfo節點的裏的節點
                xesub1.InnerText = ContractType;//設置文本節點
                el.AppendChild(xesub1);

                XmlElement xesub2 = xmlDoc.CreateElement("PayMoneyNotId");
                xesub2.InnerText = PayMoneyNotId;//設置文本節點
                el.AppendChild(xesub2);

                XmlElement xesub3 = xmlDoc.CreateElement("CustName");
                xesub3.InnerText = CustName;//設置文本節點
                el.AppendChild(xesub3);

                XmlElement xesub4 = xmlDoc.CreateElement("PayMoney");
                xesub4.InnerText = PayMoney;//設置文本節點
                el.AppendChild(xesub4);

                XmlElement xesub5 = xmlDoc.CreateElement("PayMoneyLimitT");
                xesub5.InnerText = PayMoneyLimitT;//設置文本節點
                el.AppendChild(xesub5);

                XmlElement xesub6 = xmlDoc.CreateElement("PayMoneyLimitTUnit");
                xesub6.InnerText = PayMoneyLimitTUnit;//設置文本節點
                el.AppendChild(xesub6);

                XmlElement xesub7 = xmlDoc.CreateElement("ContractName");
                xesub7.InnerText = ContractName;//設置文本節點
                el.AppendChild(xesub7);

                XmlElement xesub8 = xmlDoc.CreateElement("ContractNo");
                xesub8.InnerText = ContractNo;//設置文本節點
                el.AppendChild(xesub8);

                XmlElement xesub9 = xmlDoc.CreateElement("ContractStartT");
                xesub9.InnerText = ContractStartT;//設置文本節點
                el.AppendChild(xesub9);

                XmlElement xesub10 = xmlDoc.CreateElement("ContractEndT");
                xesub10.InnerText = ContractEndT;//設置文本節點
                el.AppendChild(xesub10);

                XmlElement xesub11 = xmlDoc.CreateElement("ContractRemarks");
                xesub11.InnerText = ContractRemarks;//設置文本節點
                el.AppendChild(xesub11);

                XmlElement xesub12 = xmlDoc.CreateElement("ContractId");
                xesub12.InnerText = ContractId;//設置文本節點
                el.AppendChild(xesub12);
                xmldocSelect.AppendChild(el);

                xmlDoc.Save(Server.MapPath("/WebTest/DocumentManage/User.xml")); //保存xml文件
            }
        }

User.xml最初文件

<?xml version="1.0" encoding="utf-8"?>
<User></User>