VB.Net Datagridview Add quantity existing value -

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i have indexed unbound datagridview. i'm trying add quantity + , stands existing quantity plus. 

eg.:- itemcode 001  luxsoap  quantity 10 .

again, want add same product quantity 10. if added cells total become 20.

how achieve functionality? i'm using vb.net unbound datagridview.

here code:- dim rnum integer = dgvsale.rows.add()

    dgvsale.rows.item(rnum).cells("itemcode").value = txtsalebarcode.text     dgvsale.rows.item(rnum).cells("prname").value = txtsaleitemname.text     dgvsale.rows.item(rnum).cells("price").value = txtsaleprice.text     dgvsale.rows.item(rnum).cells("grqty").value = txtsaleqty.text     dgvsale.rows.item(rnum).cells("amnt").value = txtsaleamount.text     dgvsale.rows.item(rnum).cells("invnum").value = txtinvno.text     dgvsale.rows.item(rnum).cells("gstamnt").value = gstcollect.text      'dgvsale.rows.item(rnum).cells("qtyinhand").value = lbldisplayqtyinhand.text      dim found boolean = false     if dgvsale.rows.count > 0         'check if product id exists same quantity         each row datagridviewrow in dgvsale.rows             if convert.tostring(row.cells(0).value) = txtsalebarcode.text andalso convert.tostring(row.cells(3).value) = txtsaleqty.text                 'update quantity of found row                 row.cells(0).value = convert.tostring(txtsaleqty.text + convert.toint16(row.cells(3).value))                 found = true              end if         next


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