private bool ValidateModel() { var result = true; if (result) { if (_view.comboBoxSection.SelectedIndex == 0) { MessageBox.Show("Wybierz sekcje"); result = false; } } if (result) { var sectionList = _model.GetSections(); var sectionText = (string)_view.comboBoxSection.SelectedItem; var section = sectionList.Where(p => p.Name == sectionText).FirstOrDefault(); if (section == null) { MessageBox.Show("Błąd sekcji"); result = false; } } return(result); }