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        private void button2_Click(object sender, EventArgs e)
        {
            new Thread(TestDauerläufer).Start();
        }
        private void TestDauerläufer()
        {
            for (int i = 0; i < 100000; i++)
            {
                //for (int j = 0; j < 1000000; j++)
                //{
                    for (int k = 0; k < 1000000; k++)
                    {
                        int[] ABC = new int[10000];
                    }
                //}
                //progressBar1.Value = i;
                this.Invoke(new MethodInvoker(DoCheapGuiAccess));
            }
        }
        private void DoCheapGuiAccess()
        {
            progressBar1.Value = progressBar1.Value + 1;
        }