> Thank you Adam,
> Currently I only use Select in the thread, the reason is that
> customers complaint about their white screen, said our program freeze
> their laptop, so use one thread backgroud to do select stuff, and
> main process wait for the thread terminated which can get rid of the
> white screen.In fact, only one thread can running background, so I
> can not imagine the connection can cause this problem, but I can try.
>
> Regards,
> Roc
>

I should also mention that some components have SQLMonitors. IBX for
example doesn't do anything if you have the traceflags set but sleep
the main thread. You need to either constantly poll
Application.ProcessMessages or turn off the trace flags. Perhaps you
may be seeing something like this?

Adam