private void setup(object sender, PaintEventArgs e) {
        int x = 50;
        int y = 50;
        int w = 15;
        int h = w;
        Color color = Color.FromArgb(255, 255, 255);

        Point location = new Point(x, y);
        Size size = new Size(w, h);

        Task t = Task.Run(()=> {

            Rectangle Rect = new Rectangle(location, size);

            e.Graphics.DrawRectangle(new Pen(color), Rect);
            e.Graphics.FillRectangle(new SolidBrush(color), Rect);

            Thread.Sleep(5000);

        });
    }