why does the acadApp need to be visible?

[agonzalez]

I'm wondering if there is a reason for why when manipulating the AutoCAD
application via COM is it necessary to have it's window be visible:

acadApp.Visible = true;

If it is not visible this ocurrs:

An unhandled exception of type
'System.Runtime.InteropServices.COMException' occurred in ConvertDWG.exe
Additional information: AutoCAD main window is invisible

Any insight:

Thanks,

Alex

[Wyatt Earp]

What API call does the exception occur on? I have done quite a bit of
stuff with c# (looks like the language you are using) without any bit
of AutoCAD visible (though I did have my form visible).