Managed DirectX (in C#) lighting question

Following through a book called Managed DirectX9 Kickstart by Tom Miller.. the books a few years old, and the API has changed a bit. A few things (like the SetPosition() function now being the Position property) were trivial to fix, but there's one problem that I can't find a solution for.

The problem is with lighting. Specifically, I have a Microsoft.DirectX.Direct3D.Device object device, and when I call:
devices.Lights[0].Commit()
I get an error that the function doesn't exist. I've heard that this function was replaced with the Update() function, but when I put that in, the lighting does not work as expected.

Any ideas?

Here's the relevant code (some functions omitted):


 public partial class Form1 : Form
    {
        private Device device = null;
        private float angle = 0.0f;

        public void InitializeGraphics()
        {
            PresentParameters presentParams = new PresentParameters();
            presentParams.Windowed = true;
            presentParams.SwapEffect = SwapEffect.Discard;

            device = new Device(0, DeviceType.Hardware, this, CreateFlags.HardwareVertexProcessing, presentParams);
        }

        private void SetupCamera()
        {
            device.Transform.Projection = Matrix.PerspectiveFovLH((float)Math.PI / 4, this.Width / this.Height, 1.0f, 100.0f);
            device.Transform.View = Matrix.LookAtLH(new Vector3(0, 0, 5.0f), new Vector3(), new Vector3(0, 1, 0));
            device.Transform.World = Matrix.RotationAxis(new Vector3(angle / ((float)Math.PI * 2.0f), angle / ((float)Math.PI * 4.0f), angle / ((float)Math.PI * 6.0f)), angle / (float)Math.PI);
            angle += 0.1f;

            device.RenderState.Lighting = true;
            device.RenderState.CullMode = Cull.None;
        }

        protected override void OnPaint(PaintEventArgs e)
        {
            device.Clear(ClearFlags.Target, System.Drawing.Color.CornflowerBlue, 1.0f, 0);
            SetupCamera();
            
            CustomVertex.PositionNormalColored[] verts = new CustomVertex.PositionNormalColored[3];

            verts[0].Position = new Vector3(0.0f, 1.0f, 1.0f);
            verts[0].Normal = new Vector3(0.0f, 0.0f, -1.0f);
            verts[0].Color = System.Drawing.Color.White.ToArgb();

            verts[1].Position = new Vector3(-1.0f, -1.0f, 1.0f);
            verts[1].Normal = new Vector3(0.0f, 0.0f, -1.0f);
            verts[1].Color = System.Drawing.Color.White.ToArgb();

            verts[2].Position = new Vector3(1.0f, -1.0f, 1.0f);
            verts[2].Normal = new Vector3(0.0f, 0.0f, -1.0f);
            verts[2].Color = System.Drawing.Color.White.ToArgb();

            device.Lights[0].Type = LightType.Point;
            device.Lights[0].Position = new Vector3();
            device.Lights[0].Diffuse = System.Drawing.Color.White;
            device.Lights[0].Attenuation0 = 0.2f;
            device.Lights[0].Range = 10000.0f;
            device.Lights[0].Enabled = true;
            device.Lights[0].Update();
            
            device.BeginScene();
            device.VertexFormat = CustomVertex.PositionColored.Format;
            device.DrawUserPrimitives(PrimitiveType.TriangleList, 1, verts);
            device.EndScene();

            device.Present();
            this.Invalidate();
        }
    }
}

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