> Seems like a lot of people have trouble with this error.  Here's my
> solution.  I give it to the future.  Because I love you.
>
> private void WaitAll(WaitHandle[] waitHandles) {
>   if (Thread.CurrentThread.ApartmentState == ApartmentState.STA) {
>     // WaitAll for multiple handles on an STA thread is not supported.
>     // ...so wait on each handle individually.
>     foreach(WaitHandle myWaitHandle in waitHandles) {
>       WaitHandle.WaitAny(new WaitHandle[]{myWaitHandle});
>     }
>   }
>   else {
>     WaitHandle.WaitAll(waitHandles);
>   }
> }