You can try this:
c_filter = "!ps_printed .and. ordno >= " + thisform.combo1.value +" .and. ordno <= " + thisform.combo2.value
SET FILTER TO &c_filter
Ofcource that is valid if the value of comboboxes is string.
HTH
Boris
Against Stupidity the Gods themselves Contend in Vain - Johann Christoph Friedrich von Schiller
The only thing normal about database guys is their tables.