public Catalogue Save(Catalogue catalogue) { if (catalogue == null) throw new ArgumentNullException("catalogue"); if (String.IsNullOrEmpty(catalogue.Name)) throw new ArgumentNullException("Neplatný parametr Name"); CatalogueRepository repository = new CatalogueRepository(); if (catalogue.CatalogueID == 0) { catalogue.Created = DateTime.Now; catalogue.Modified = catalogue.Created; catalogue = repository.Create(catalogue); } else { catalogue.Modified = DateTime.Now; catalogue = repository.Update(catalogue); } return catalogue; }