controls doesn't show if run on a background thread ( c# winform)

Question

I have a form (complexForm in the code) with multiple controls which takes some time to load. So I decided to put in in a separate thread in order to decrease i

Answer 1

Do not do this. It'll end in tears. Only ever create UI controls from the UI thread - that's the thread that owns the message pump, which is crucial to proper operation.

The right solution to this is to create a Splash Screen which is shown while your main window is initialising.

There's quite a few threads on Stack Overflow about how to create a splash screen.