Fixed part in custom painted usercontrol with autoscroll c# windows forms

Question

I would like to create a table like control where a number of top rows stay in place when scrolling. I paint the control in an override of the OnPaint method.

When scrolling some partial repaint happens automatically, but this creates artefacts and looks weird. To solve that I call Invalidate(); or Refresh(); in an eventhandler attached to the scroll event and take the scrollposition in to account when painting the part that is supposed to scroll in / out of view. However when I do this the part that is supposed to stay in place gets scrolled out and sent back again and again. (so it is sort of flickering) I am trying to make this work smoothly without the flickering.

To simplify the issue I have made the following code where I draw a line that is supposed to stay in place when scrolling. As you can see it starts flickering when scrolling.

I have already thought of doublebuffering and such as you can see in the code.

Does anyone know how to make the line stay in place? Thanks in advance.

using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Drawing;
using System.Data;
using System.Linq;
using System.Text;
using System.Windows.Forms;
using System.Diagnostics;

namespace ColumnReaderUITryOut
{
    public partial class CustomPaintScrollTest : UserControl
    {
        public CustomPaintScrollTest()
        {
            InitializeComponent();
            AutoScrollMinSize = new Size(500, 600);
            SetStyle(ControlStyles.OptimizedDoubleBuffer, true);
            SetStyle(ControlStyles.AllPaintingInWmPaint, true);
            SetStyle(ControlStyles.UserPaint, true);
            ResizeRedraw = true;
        }

        protected override void OnPaint(PaintEventArgs e)
        {
            base.OnPaint(e);
            e.Graphics.DrawLine(Pens.Black, 0, 0, Width, Height);
        }

        private void CustomPaintScrollTest_Scroll(object sender, ScrollEventArgs e)
        {
            Invalidate();
        }
    }
}