difference between STA and MTA

What if I omit the XXXThread attribute? Then I cannot use COM controls but I
can use normal windows controls?
When is CoInitialize() called if I use COM? Is it called in the initializing
code of the XXXThread attribute? And when is CoUninitialize called?

"Richard Blewett [DevelopMentor]" <richardb@NOSPAMdevelop.com> schrieb im
Newsbeitrag news:ujdljab%23EHA.2272@TK2MSFTNGP10.phx.gbl...
> So the crucial thing is which apartment type should you choose for your
> code.
>
> If you are doing Windows Forms programming *always* mark the main thread
> with the STAThread attribute. Some controls are wrappers around ActiveX
> controls and so COM interop with be being used. ActiveX controls are all
> STA based and IIRC don't support being hosted from an MTA thread.
>
> Any other project you can omit the attribute unless it performs COM
> interop where you should really take control of your thread's apartment
> state. You want to make sure the thread enters the same typoe of apartment
> as the COMM object it is calling. There is a 1000 fold performance penalty
> for calling cross apartment compared with intra apartment calls
>
> Regards
>
> Richard Blewett - DevelopMentor
> http://www.dotnetconsult.co.uk/weblog
> http://www.dotnetconsult.co.uk
>
> As Richard said, STA's and MTA's are artifacts of COM. <snip: Joakim's
> excellent description of apartments omitted from brevity>
>