Question

First of all, this will not be a post about Database Transactions. I want to know more about the TransactionModel in .NET 2.0 and higher. Since I am developing against .NET 3.5 newer models are apprechiated.

Now, what I would like to acheive is something like the following

    public void Withdraw(double amount)
    {
        using (TransactionScope scope = new TransactionScope())
        {
            Money -= amount;

            if (Money > 0)
                scope.Complete();
        }
    }

Which would mean that when the Money is less than 0, everything inside the TransactionScope should be RolledBack, however, it’s not.

A simple test as followed

        ImportantObject obj = new ImportantObject(1);

        Console.WriteLine(obj.Money);

        obj.Withdraw(101);

        Console.WriteLine(obj.Money);

Provided that the Stadard Money amount is 100.

Did I miss something here or is this not how the transactions should work? And what are the performance losses using this model?

Answer 1

You may want to read Volatile Resource Managers in .NET: Bring Transactions to the Common Type by Juval Lowy.