private ObservableCollection <Warehouse> BuildWarehouseDropDown() { List <Warehouse> list = new List <Warehouse>(); list = _serviceAgent.GetWarehousesReadOnly(ClientSessionSingleton.Instance.CompanyID).ToList(); list.Add(new Warehouse()); list.Sort((x, y) => string.Compare(x.Name, y.Name)); return(new ObservableCollection <Warehouse>(list)); }