It really doesn't matter if it's in or out of VS when it's running, if an app is throwing invalid cross-thread operation exceptions then it's not observing the "One GUI Thread" rule. The only reliable way to do so is to use the IvokeRequired/Invoke/BeginInvoke members of the Control class. :badger:

Luc Pattyn wrote: numeric strings Oxymoron. :-D Luc Pattyn wrote: negative inclination I decline to respond to that.