This is only possible with the help of FillSceneGraph event. Here I’m using a polygon with a hatch. If you need to add each vertical line manually, you can always do that, too, since you already have the points. I’m not really sure what you mean by displaying the weeks. Does that mean week numbers? I don’t think there’s a string format that does that, and if so, you’ll need to implement IRenderLabel , find the week number from the date and insert is as a string into the label.

private void Form1_Load(object sender, EventArgs e)
{
    ultraChart1.Data.DataSource = new int[,]
    {
        {1,2,1,3,2,4,3,5,4,5},
        {4,5,4,7,4,7,6,7,9,8}
    };
}

private void ultraChart1_FillSceneGraph(object sender, FillSceneGraphEventArgs e)
{
    List lines = new List();
    List points = new List();

    foreach (var p in e.SceneGraph)
    {
        if (p is Polyline) lines.Add(p as Polyline);
    }

    if (lines.Count < 2) return;

    foreach (var point in lines[0].points)
    {
        points.Add(point.point);
    }

    foreach (var point in lines[1].points.Reverse())
    {
        points.Add(point.point);
    }

    Polygon area = new Polygon(points.ToArray());
    PaintElement pe = new PaintElement();
    pe.ElementType = PaintElementType.Hatch;
    pe.Hatch = FillHatchStyle.Vertical;
    pe.Fill = Color.Red;
    pe.FillStopColor = Color.Transparent;
    area.PE = pe;

    e.SceneGraph.Add(area);
}