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[.net] Rotating a triangle

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Hi everyone ! I was reading a tutorial and now I have a problem that they don't explain. I have the following code and the only bug is that it's not rotating even though everything seems correct to me.
using System;
using System.Drawing;
using System.Windows.Forms;
using Microsoft.DirectX;
using Microsoft.DirectX.Direct3D;

namespace DirectX_Tutorial
{
	public class WinForm : Form
	{
		private Device device;
		private float Theta = 0f;
		private CustomVertex.PositionColored[] Vertices;

		public WinForm()
		{
			this.ClientSize = new Size(640, 480);
			this.Name = "WinForm";
			this.Text = "DirectX Tutorial";
			InitializeDevice();
			InitializeVertices();
			CameraPositioning();
		}

		public void InitializeDevice()
		{
			PresentParameters PresParams = new PresentParameters();
			PresParams.Windowed = true;
			PresParams.SwapEffect = SwapEffect.Discard;
			device = new Device(0, DeviceType.Hardware, 
				this, CreateFlags.SoftwareVertexProcessing, PresParams); 
		}

		public void InitializeVertices()
		{
			Vertices = new CustomVertex.PositionColored[3];
			Vertices[0].Position = new Vector3(0f, 0f, 0f);
			Vertices[0].Color = Color.Yellow.ToArgb();
			Vertices[1].Position = new Vector3(10f, 0f, 0f);
			Vertices[1].Color = Color.Blue.ToArgb();
			Vertices[2].Position = new Vector3(5f, 10f, 0f);
			Vertices[2].Color = Color.Red.ToArgb();
		}

		public void CameraPositioning()
		{
			device.Transform.Projection = Matrix.PerspectiveFovLH((float)Math.PI/4,
				this.Width/this.Height, 1f, 50f);
			device.Transform.View = Matrix.LookAtLH(new Vector3(0f, 0f, 30f), new Vector3(0f, 0f, 0f),
				new Vector3(0f, 1f, 0f));
			device.RenderState.Lighting = false;
			device.RenderState.CullMode = Cull.None;
		}

		protected override void OnPaint(PaintEventArgs args)
		{
			device.Clear(ClearFlags.Target, Color.DarkBlue, 1.0f, 0);

			device.BeginScene();
			device.VertexFormat = CustomVertex.PositionColored.Format;
			device.Transform.World = Matrix.RotationX(Theta);
			device.DrawUserPrimitives(PrimitiveType.TriangleList, 1, Vertices);
			device.EndScene();

			device.Present();
			Theta += 0.05f;
		}

		static void Main() 
		{
			using (WinForm our_dx_form = new WinForm())
			{
				Application.Run(our_dx_form);
			}
		}
	}
}

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Try adding on this.Invalidate(); at the very end of your OnPaint method. My guess is that the control just paints itself once and then has no reason to paint itself again. If you invalidate the form at the end of your paint method it will tack another request for the control to paint itself in the message queue.

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Add the following to the Constructor for your form

this.Setstyle(Controlstyles.AllPaintingInWmPaint | Controlstyles.Opaque, true)

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