I want that my window is completely hidden on the startup. No window, no entry in the taskbar. The user doesn\'t see, the application is started.
How can I realize that?
Simply don't create a window, just delete the StartupUri from App.xaml.
StartupUri
It might be helpful to set the Application to ShutDownMode="OnExplicitShutdown" this will prevent that your application shuts down if your last window was closed.
ShutDownMode="OnExplicitShutdown"