1.Dim n As Integer = DataGridView2.CurrentRow.Index
2. Dim key As String = DataGridView2.Item(3, n).Value
3. sql = "select * from store where store_amount = " & key & ""
4. If NumericUpDown1.Value > key Then
5. msg_error("กรอกเกินจำนวน")
6. NumericUpDown1.Value = Nothing
7. Return
8. End If
