public ObservableCollection<RegistroModel> Download_CIRegistroRecurrent(long fechaActual, long fechaFin, long LastModifiedDate, long ServerLastModifiedDate)
 {
     ObservableCollection<RegistroModel> registros = new ObservableCollection<RegistroModel>();
     try
     {
         using (var repository = new RegistroRepository())
         {
             registros = repository.GetRegistrosRecurrent(fechaActual, fechaFin, LastModifiedDate, ServerLastModifiedDate);
         }
     }
     catch (Exception)
     {
         ;
     }
     return registros;
 }