.NET Windows Service needs to use STAThread

Question

I have created a Windows Service that will be calling out to some COM components, so I tagged [STAThread] to the Main function. However, when the timer fires, it reports MT

Answer 1

That cannot work in a service, the thread that calls your Main() method was already started by the service manager. You'll need to create a separate thread that is initialized with Thread.SetApartmentState() and pumps a message loop.