X++:
switch (SalesFilterComboBox.selection())
{
case CRMSalesFilter::All :
qbrSalesOrder.value(SysQuery::valueUnlimited());
break;
case CRMSalesFilter::SalesOrder :
qbrSalesOrder.value(SysQuery::valueEmptyString());
break;
default :
qbrSalesOrder.value(queryValue(SalesFilterComboBox.selection()));
break;
}