This sample contains a helpful section that sends all ECO SQL logs to the Output window:

Eco.Logging.EcoLogSwitches.LogSql = true;
Eco.Logging.EcoListener.Singleton.OnTraceLog += (sender, args) =>
    {
        System.Diagnostics.Trace.WriteLine(Thread.CurrentThread.Name + ":" + args.Message);
    };
Eco.Logging.EcoListener.StartListening();