Bi-directional dependency relationship detected!

public override Task OnDisconnected(bool stopCalled)
{
    if (stopCalled)
    {
        // We know that Stop() was called on the client,
        // and the connection shut down gracefully.
    }
    else
    {
        // This server hasn't heard from the client in the last ~35 seconds.
        // If SignalR is behind a load balancer with scaleout configured, 
        // the client may still be connected to another SignalR server.
    }

    return base.OnDisconnected(stopCalled);
}

window.onbeforeunload = function (e) {
    $.connection.hub.stop();
};