使用嵌套事务范围更新数据库

在我的应用程序中，我有两个方法:GetPaymentToDate和RemovePayment:

public Payment RemovePayment(int paymentId)
{
    Payment payment;
    using (var transaction = new TransactionScope(TransactionScopeOption.RequiresNew,
        new TransactionOptions { IsolationLevel = IsolationLevel.Serializable }))
    {
        //some staff
        m_staffContext.SaveChanges();
        transaction.Complete();
    }
    return payment;
}
public Payment GetPaymentToDate(DateTime paymentDate)
{
    var payment = new Payment
    {
        //initialize properties
    };
    using (var transaction = new TransactionScope(TransactionScopeOption.RequiresNew,
        new TransactionOptions { IsolationLevel = IsolationLevel.Serializable }))
    {
        m_staffContext.Payments.Add(payment);
        m_staffContext.SaveChanges();
        transaction.Complete();
    }
    return payment;
}

不，我需要实现Update方法。这种方法的逻辑是删除旧的支付，然后创建一个新的支付。因此，如果另一个失败，我想在一个父事务范围和角色回嵌套事务中做到这一点。我要从现有的方法中删除TransactionScopeOption.RequiresNew选项，并在更新方法中这样写:

public Payment UpdatePayment(int paymentId)
{
    Payment newPayment;
    using (var transaction = new TransactionScope(TransactionScopeOption.RequiresNew,
        new TransactionOptions { IsolationLevel = IsolationLevel.Serializable }))
    {
        var removedPayment = RemovePayment(paymentId);
        var newPayment = GetPaymentToDate(removedPayment.Date);
        m_staffContext.SaveChanges();
        transaction.Complete();
    }
    return newPayment;        
}

我的代码正确吗?

using( var transaction = .....)
{
   var payment = m_staffContext.Payments.Get(paymentId);
   m_staffContext.Payments.Remove(payment);
   m_staffContext.Payments.Add(payment);
   m_staffContext.SaveChanges();
}