private void GetDivision() { List <Division> divList = core.GetDivisions(); DivisionList = new ObservableCollection <Division>(divList.Select(x => new DivisionVM { DivisionName = x.DivisionName }).ToList()); FreeDivisions = new ObservableCollection <string>(divList.Select(x => new StringBuilder(x.DivisionName).ToString()).ToList()); FreeDivisions.Add("-"); }