Cannot get callback in c# using Devnet

Hello,
Wondering if anyone has any experience doing this and can help me out.  I have set up a QCallbackConnection and I am trying to get a callback when `trade table gets updated, but I never seem to get any callbacks.  I have

var q = new QCallbackConnection("localhost", 17011, UserName, Password); q.DataReceived += OnData; q.ErrorOccured += OnError; q.Open();

I have tried loading in u.q and then calling sub[trade;] by doing 

q.StartListener();q.Async("sub", "trade", "");

but that doesn’t work.. Anybody have any ideas?

Thanks!