private void AddTimetable(object parameter) { if (!ValidateParams(parameter)) { ShowInfoWindow("Podaj poprawne dane"); return; } var values = (object[])parameter; MatchViewModel matchTimetable = (MatchViewModel)values[0]; ReffereViewModel refereeTimetable = (ReffereViewModel)values[1]; timetableService.AddTimetable(matchTimetable.ID, refereeTimetable.ID); UpdateTimetableGrid(); }