>Hi Basoz,
>
>Thank you for your helpful suggestion?
>
>How about the works on Grid, or you have show me the works on Grid??
>
>
>Ransome

select column2field, column3field ;
 from (thisform.myGrid.recordsource) ;
 into array thisform.arrCheck

* Column2.text1.lostfocus
if recno() > 1 and ;
  Column2Field <= thisform.arrCheck[recno()-1,2]
* Prompt
  nodefault
  this.setfocus
else
  thisform.arrCheck[recno(),1] = Column2Field 
endif

* Column3.text1.lostfocus
if recno() < reccount()-1 ;
  Column3Field > thisform.arrCheck[recno()-1,2]
* Prompt
  nodefault
  this.setfocus
else
  thisform.arrCheck[recno(),2] = Column3Field 
endif

This is a quick idea code. You should take into account newly inserted ones would be negative and select might need an order by if index is in effect.
Cetin