每个人都会的小疑点，就小弟我不会,求真解，求好汉，江湖救急

            DataTable dt = new DataTable();            dt.Columns.Add("filename");            dt.Columns.Add("phototitle");            dt.Rows.Add(new object[] { "./img/img04.jpg", "www.sharejs.com - 图片4" });            dt.Rows.Add(new object[] { "./img/img05.jpg", "www.sharejs.com - 图片5" });            XmlDocument xml = new XmlDocument();            XmlDeclaration declar = xml.CreateXmlDeclaration("1.0", "utf-8", null);            xml.AppendChild(declar);            XmlNode root = xml.CreateElement("root");            xml.AppendChild(root);            foreach (DataRow r in dt.Rows)            {                XmlNode photo = xml.CreateElement("photo");                XmlNode filename = xml.CreateElement("filename");                filename.InnerText = r["filename"].ToString();                XmlNode phototitle = xml.CreateElement("phototitle");                phototitle.InnerText = r["phototitle"].ToString();                photo.AppendChild(filename);                photo.AppendChild(phototitle);                root.AppendChild(photo);            }            xml.Save(@"E:\1.xml");