public ActionResult GetVisitsByFilter(DataTablesRequest dataTablesRequest, VisitFilter visitFilter)
        {
            Service serv = new Service();
            int totalRecordsNumber;
            var visitList = serv.GetVisitsByFilter(dataTablesRequest, visitFilter, out totalRecordsNumber);

            return new DataTablesResult(dataTablesRequest.sEcho, totalRecordsNumber, totalRecordsNumber, visitList);
        }