Instance a new form in a thread

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C#

forms

multi-threading

My Problem is, that i want to show something like a Splashscreen while the Application is Busy. I wanted to Create a Thread starting a new form with a progess bar and a little information that the user has to wait.
So far so good, but the form freezes as it show's up. (If I don't do the update, I commented out, the form not even builds properly).

What is the problem here?

What I have tried:

public class WaitFormManager
    {
        private Thread waitFormThread;

        public WaitFormManager()
        {
            waitFormThread = new Thread(new ThreadStart(OpenWaitform));
        }

        public void ShowWaitForm()
        {
            if (!waitFormThread.IsAlive)
            {
                waitFormThread.Start();
            }
        }

        public void HideWaitForm()
        {
            if (waitFormThread.IsAlive)
            {
                waitFormThread.Abort();
            }
        }

        private void OpenWaitform()
        {
            WaitForm wf = new WaitForm();
            wf.Show();
            //wf.Update();
        }
    }

I called the Form this way:

public static WaitFormManager wfm = new WaitFormManager();
wfm.ShowWaitForm();
//Here we get some stuff done
System.Threading.Thread.Sleep(2000);
wfm.HideWaitForm();