private void dgProducts_CellBeginEdit(object sender, DataGridViewCellCancelEventArgs e)
        {
            // Начало редактирования
            if (e != null)
                if (e.ColumnIndex == 4)
                {
                    // Это колонка со списком штрих кодов
                    int nTry = 0;
                    int.TryParse(dgProducts.Rows[e.RowIndex].Cells["ProductID"].Value.ToString(), out nTry);

                    if (nTry > 0)
                        strBarCodeFilter = "ParentID = '" + nTry.ToString() + "'";

                    bindingSourceBarCodes.Filter = strBarCodeFilter;
                }
        }

        private void dgProducts_CellEndEdit(object sender, DataGridViewCellEventArgs e)
        {
            if (strBarCodeFilter.Trim() != "")
            {
                strBarCodeFilter = "";
                bindingSourceBarCodes.Filter = strBarCodeFilter;
                bindingSourceProducts.ResumeBinding();
            }
        }