Progressbar mit Timer 2

        private void button1_Click(object sender, EventArgs e)
        {
            ProgressBar progressBar1 = new ProgressBar();
            progressBar1.Maximum = sekunden;
            progressBar1.Minimum = 0;

            countdown_timer = new Timer();
            countdown_timer.Tick += new EventHandler(countdown_timer_Tick);
            countdown_timer.Interval = 1000; // 1 Sekunde
            countdown_timer.Start();
        }

        private int sekunden = 15;

        private void countdown_timer_Tick(object sender, EventArgs e)
        {
            if (sekunden > 0)
            {
                sekunden -= 1;
                label1.Text = sekunden.ToString();
                progressBar1.Value++;
            }

            if (sekunden == 0)
            {
                countdown_timer.Stop();
            }
        }