Show form on another thread after startup [on hold]

I am trying to open a form right on another thread right after the program starts to check for updates, but when I run this I get an error; an ObjectDisposedException.

Can anyone tell why this happens or how I can fix this?

[STAThread]
static void Main(string[] args)
{
    Application.EnableVisualStyles();
    Application.SetCompatibleTextRenderingDefault(false);

    SplashScreen splash = new SplashScreen();

    Thread updateThread = new Thread(new ThreadStart(openUpdateForm));
    updateThread.Start();

    splash.Show();
    Application.Run();
}

public static void openUpdateForm()
{
    UpdateForm uForm = new UpdateForm(false);
    uForm.Show(); // <- ObjectDisposedException
}