关于自动增值列的问题

ID列已经设置为自动增长列  增值为1               BookStoreDataSet.SellRow row1 = bookStoreDataSet1.Sell.NewSellRow();
            if (customerID > 0)
            {
                row1.CustomerID = customerID;
            }
            // ID为自动增长列
            row1.Sum = this.total;
            row1.Time = DateTime.Now;
            bookStoreDataSet1.Sell.AddSellRow(row1);
            SellAdapter.Update(bookStoreDataSet1.Sell);
在给其他的列给值时候 老是提示ID列不能为空