Transactional code with a Volatile Resource Manager

Transactional.cs

// http://www.codeguru.com/csharp/.net/net_data/sortinganditerating/article.php/c10993/SystemTransactions-Implement-Your-Own-Resource-Manager.htm
// https://msdn.microsoft.com/en-us/library/ms229975(v=vs.85).aspx

public class VolatileRM : IEnlistmentNotification
{
    private int memberValue = 0;
    private int oldMemberValue = 0;

    public int MemberValue
    {
        get { return memberValue; }
    }

    public void SetMemberValue(int newMemberValue)
    {
        Transaction currentTx = Transaction.Current;
        if (currentTx != null)
        {
            Console.WriteLine("VolatileRM: SetMemberValue - EnlistVolatile");
            currentTx.EnlistVolatile(this, EnlistmentOptions.None);
        }
        oldMemberValue = memberValue;
        memberValue = newMemberValue;
    }

    #region IEnlistmentNotification Members

    public void Commit(Enlistment enlistment)
    {
        Console.WriteLine("VolatileRM: Commit");
        // Clear out oldMemberValue
        oldMemberValue = 0;
    }

    public void InDoubt(Enlistment enlistment)
    {
        Console.WriteLine("VolatileRM: InDoubt");
    }

    public void Prepare(PreparingEnlistment preparingEnlistment)
    {
        Console.WriteLine("VolatileRM: Prepare");
        preparingEnlistment.Prepared();
    }

    public void Rollback(Enlistment enlistment)
    {
        Console.WriteLine("VolatileRM: Rollback");
        // Restore previous state
        memberValue = oldMemberValue;
        oldMemberValue = 0;
    }

    #endregion
}

class Program
{
    static void Main(string[] args)
    {
        var value = new VolatileRM();
        value.SetMemberValue(5);

        using (var scope = new TransactionScope())
        {
            value.SetMemberValue(10);
            scope.Complete();
        }

        Console.WriteLine("Member value: " + value.MemberValue.ToString()); // Value changed to 10

        using (var scope = new TransactionScope())
        {
            value.SetMemberValue(20);
        }

        Console.WriteLine("Member value: " + value.MemberValue.ToString()); // Value continues 10, since the transaction wasn't completed
        Console.ReadLine();
    }
}