C# BackgroundWorker's culture

I woudl like to set the culture for my whole application. I tried the following :

Thread.CurrentThread.CurrentCulture = CultureInfo.CreateSpecificCulture(wantedCulture);
Thread.CurrentThread.CurrentUICulture = CultureInfo.CreateSpecificCulture(wantedCulture);
Application.CurrentCulture = CultureInfo.CreateSpecificCulture(wantedCulture);

It works for the current thread, but later on I create and start a background worker thread. When I create the worker, the current thread executes with the wantedCulture but the worker thread will run with my computer's culture.

Any ideas to set the culture for the whole application?