web service issue

Question

Hi all , 

I use the following web method to give xml file

    public XmlDocument CustomertList()
        {

            conn = ConfigurationManager.AppSettings["ConnectionString"];

            SqlXmlCommand cmd = new SqlXmlCommand(conn);
            cmd.CommandType = SqlXmlCommandType.Sql;
           // cmd.RootTag = "WorkList";
            cmd.CommandText = "select name_english,ID from customers FOR XML AUTO,ELEMENTS XSINIL,ROOT('patients')";
            XmlReader xr = cmd.ExecuteXmlReader();


            XmlDocument myXmlDocument = new XmlDocument();
            myXmlDocument.Load(xr);
            // load xml content or build it up dynamically, etc
            return myXmlDocument;
        }

I want to get the XmlDocument by type the url (for example ) http://localhost:8088/IOSService.asmx?op=CustomertList

I need to have rss xml file , I mean I want to give the user url that give him / her the resulted xml

any suggestion please