业务逻辑层实现事务处理

private void customersBindingNavigatorSaveItem_Click(object sender, EventArgs e)
{
    UpdateData();
}

private void UpdateData()
{
    this.Validate();
    this.customersBindingSource.EndEdit();
    this.ordersBindingSource.EndEdit();

    using (System.Transactions.TransactionScope updateTransaction = 
        new System.Transactions.TransactionScope())
    {
        DeleteOrders();
        DeleteCustomers();
        AddNewCustomers();
        AddNewOrders();

        updateTransaction.Complete();
        northwindDataSet.AcceptChanges();
    }
}

The order for reconciling changes to related data is as follows:

• Delete child records (in this case, delete records from the Orders table)

• Delete parent records (in this case, delete records from the Customers table)

• Insert parent records (in this case, insert records in the Customers table)

• Insert child records (in this case, insert records in the Orders table)