private void SaveProductCode(Guid productId, Guid c1Id, Guid c2Id, Guid c3Id, Guid c4Id, Guid c5Id, Guid c6Id)
        {
            string      sql   = "ProductId = '" + productId.ToString() + "'";
            ProductCode oCode = ProductCode.LoadWhere(sql);

            if (oCode != null)
            {
                if (chkUpdateClass1.Checked)
                {
                    oCode.Class1Id = c1Id;
                }
                if (chkUpdateClass2.Checked)
                {
                    oCode.Class2Id = c2Id;
                }
                if (chkUpdateClass3.Checked)
                {
                    oCode.Class3Id = c3Id;
                }
                if (chkUpdateClass4.Checked)
                {
                    oCode.Class4Id = c4Id;
                }
                if (chkUpdateClass5.Checked)
                {
                    oCode.Class5Id = c5Id;
                }
                if (chkUpdateClass6.Checked)
                {
                    oCode.Class6Id = c6Id;
                }

                oCode.Save();
            }
        }