Oh! I think I see. You are displaying a "record number" in the grid - but it is not really a record number because it does not include the deleted records!

i don't want to see at mygrid itemno as
                            2
                            3
                            5
                            6

If this is correct, I assume that you have a field in your grid's RecordSource called Item_Number. If this is true, you need to renumber all of the item numbers after you delete records like this:

lnItem_Number = 0
SELECT ( Thisform.Grid1.RecordSource )
SCAN FOR NOT DELETED()
  lnItem_Number = lnItem_Number + 1
  REPLACE Item_Number WITH lnItemNumber
ENDSCAN