public void SearchParticipant(object parameter) { IEnumerable <Participant> faculty = null; IParticipant facultyObj = new ParticipantService(new Data.WpfDbContext()); if (Filter == Filter.ById) { if (int.TryParse(FilterParameter, out int res)) { faculty = facultyObj.GetDetailsById(res); } } else if (Filter == Filter.ByName) { faculty = facultyObj.GetDetailsByName(FilterParameter); } FilterParticipant = new ObservableCollection <Participant>(faculty); }