public IEnumerable <IEnumerable <EventDTO> > GetListsByPeriod(LoginSession session, string server, IEnumerable <int> listIndexes, string from, string to) { var result = new List <List <EventDTO> >(); foreach (var idx in listIndexes) { result.Add(_adcSrv.GetListByPeriod(server, idx, from, to).Select(pair => pair.ToDTO()).ToList()); } return(result); }