怎么后台页面设置一个XMl的数据源，然后在前台用adrotator显示广告

XmlDocument node = new XmlDocument();            string filename = ImagesPath + "Xml/ad.xml";            node.Load(filename);            XmlNodeReader reader = new XmlNodeReader(node);            DataSet set = new DataSet();            set.ReadXml(reader);            RepWebList.DataSource = set;            RepWebList.DataBind();            reader.Close();