xml的简单操作

在很多情况下, 我们会用到XML,比如说配置文件等.C#提供了XML类.
这里我只是简单的写一下XML文件的生成,解析就不多说了.
第一种方法
       DataBase db = DataBaseFactory.CreateDataBase(DataBaseType.MySql, strMysql);
            DbCommand command = db.GetSqlStringCommand(strSql);
            DataTable dt = db.ExecuteDataSet(command).Tables[0];
            //string strFileName = Application.StartupPath + "\\" + "test.xml";
            DirectoryInfo file = new DirectoryInfo(strPath);
            if (!file.Exists)
            {
                file.Create();
            }
            string strFileName = strPath + "\\tech.xml";
            XmlDocument oXmlDocument = new XmlDocument();
            XmlDeclaration xde;
            xde = oXmlDocument.CreateXmlDeclaration("1.0", null, null);
            xde.Encoding = "gb2312";
            xde.Standalone = "yes";
            oXmlDocument.AppendChild(xde);
            XmlElement xe = oXmlDocument.CreateElement("Root");
            //XmlNode root = oX