public ObservableCollection<Artikal> NadjiUljeRoban(int? proizvodjacID, string viskozitet) { try { LavDataClassesDataContext _baza = new LavDataClassesDataContext(konekcioniString); DataLoadOptions _dlo = new DataLoadOptions(); if (_baza.DatabaseExists()) { ObservableCollection<Artikal> _artikli = new ObservableCollection<Artikal>(_baza.uspNadjiUlje(proizvodjacID, viskozitet).ToList()); return _artikli; } else { throw new Exception("Baza ne postoji."); } } catch (Exception ex) { throw ex; } }