private void QueryDatabase() { var balance = new ObservableListSource <BalanceItem>( ContaAtual.BalanceFiltrado( _dtpInicio.Value, _dtpTermino.Value, (string)toolStripComboBoxGrupo.SelectedItem, true, _sort)); bsBalance.DataSource = balance.Any() ? balance.ToBindingList() : null; EnableSaveButtons(); }