>I dont Have UNIQUE index the procedure is the user will write ItemNo. and in grid will show him all information for this item, and as I said same ItemNo. could be Appeared more than one time.

Could you provide more details on your data structure and other process details? Any table realtions? Is that a child grid showing the details? It is difficult to advise anything, if I don't see what are you really doing, and how your form looks like.