private void machineTypeBox_SelectionChanged(object sender, SelectionChangedEventArgs e) { try { string selectdMachine = machineTypeBox.SelectedValue.ToString(); DataTable machinGrp = DBManager.selectMachineGroups(selectdMachine); if (Convert.ToInt16(machinGrp.Rows[0][0].ToString()) == 4) { operators = DBManager.selectOperators("5"); } else { operators = DBManager.selectOperators("9"); } operatorNameBox.ItemsSource = operators.AsDataView(); } catch { } }