LogicalOperationStack (purely hypothetical)

NotRealCode.cs

public static class MyStack
{
    private static Stack CurrentContext
    {
        get
        {
            return Trace.CorrelationManager.LogicalOperationStack;
        }
    }

    public static IDisposable Push(string context)
    {
        CloneAndSetStack();
        Trace.CorrelationManager.StartLogicalOperation(context);
        return new PopWhenDisposed();
    }

    private static void CloneAndSetStack()
    {
        CallContext.LogicalSetData("System.Diagnostics.Trace.CorrelationManagerSlot", CurrentContext.Clone());
    }

    private static void Pop()
    {
        Trace.CorrelationManager.StopLogicalOperation();
    }

    private sealed class PopWhenDisposed : IDisposable
    {
        private bool disposed;

        public void Dispose()
        {
            if (disposed)
                return;
            Pop();
            disposed = true;
        }
    }

    public static string CurrentStack
    {
        get
        {
            return string.Join(" ", CurrentContext.Cast<string>().Reverse());
        }
    }
}

Just so you know, it is not necessary to change "System.Diagnostics.Trace.CorrelationManagerSlot". To trigger the copy-on-write, you just need to touch any item in the context. You could have something like that to avoid unnecessary allocations:

private static readonly object Flag = new object();
...
CallContext.LogicalSetData("Flag7645", Flag);
Trace.CorrelationManager.StartLogicalOperation(operationId);