Usage problem with InterleavedArrays

using System;
using System.Collections.Generic;
 
using OpenTK;
using OpenTK.Graphics;
using OpenTK.Graphics.OpenGL;
using OpenTK.Audio;
using OpenTK.Audio.OpenAL;
using OpenTK.Input;
 
 
 
namespace OpenTk_Test3_InterleavedArrays
{
    class Game : GameWindow
    {
        uint myBufferHandle = 0;
        float[] interleavedData;
 
        /// <summary>Creates a 800x600 window with the specified title.</summary>
        public Game() : base(800, 600, GraphicsMode.Default, "OpenTk Test3 InterleavedArrays")
        {
            VSync = VSyncMode.On;
        }
 
        /// <summary>Load resources here.</summary>
        /// <param name="e">Not used.</param>
        protected override void OnLoad(EventArgs e)
        {
            base.OnLoad(e);
            GL.ClearColor(1.0f, 1.0f, 1.0f, 0.0f);
            GL.Enable(EnableCap.DepthTest);
 
            interleavedData = new float[24]; // T + N + V = (2*3*3) * nombre de point = (2*3*3)*3 = 24
 
            // Attribution du point 1
            interleavedData[0] = 0; // u de t1
            interleavedData[1] = 0; // v de t1
            interleavedData[2] = 0; // x de n1
            interleavedData[3] = 0; // y de n1
            interleavedData[4] = 0; // z de n1
            interleavedData[5] = -1; // x de v1
            interleavedData[6] = -1; // y de v1
            interleavedData[7] = 4; // z de v1
 
            // Attribution du point 2
            interleavedData[8] = 0; // u de t2
            interleavedData[9] = 0; // v de t2
            interleavedData[10] = 0; // x de n2
            interleavedData[11] = 0;// y de n2
            interleavedData[12] = 0;// z de n2
            interleavedData[13] = 1; // x de v2
            interleavedData[14] = -1; // y de v2
            interleavedData[15] = 4; // z de v2
 
            // Attribution du point 3
            interleavedData[16] = 0; // u de t3
            interleavedData[17] = 0; // v de t3
            interleavedData[18] = 0; // x de n3
            interleavedData[19] = 0; // y de n3
            interleavedData[20] = 0; // z de n3
            interleavedData[21] = 0; // x de v3
            interleavedData[22] = 1; // y de v3
            interleavedData[23] = 4; // z de v3
 
 
            GL.GenBuffers(1, out myBufferHandle);
            GL.BindBuffer(BufferTarget.ArrayBuffer, myBufferHandle);
            GL.BufferData(BufferTarget.ArrayBuffer, new IntPtr(24 * sizeof(float)), interleavedData, BufferUsageHint.StaticDraw);
            GL.InterleavedArrays(InterleavedArrayFormat.T2fN3fV3f, 0, (IntPtr)null);
        }
 
        /// <summary>
        /// Called when it is time to render the next frame. Add your rendering code here.
        /// </summary>
        /// <param name="e">Contains timing information.</param>
        protected override void OnRenderFrame(FrameEventArgs e)
        {
            base.OnRenderFrame(e);
 
            GL.ClearColor(Color4.Blue);
            GL.Clear(ClearBufferMask.ColorBufferBit | ClearBufferMask.DepthBufferBit);
 
            Matrix4 modelview = Matrix4.LookAt(Vector3.Zero, Vector3.UnitZ, Vector3.UnitY);
 
            GL.MatrixMode(MatrixMode.Modelview);
            GL.LoadMatrix(ref modelview);
 
            GL.EnableClientState(ArrayCap.VertexArray);
 
            GL.BindBuffer(BufferTarget.ArrayBuffer, myBufferHandle);
            GL.InterleavedArrays(InterleavedArrayFormat.T2fN3fV3f, 0, IntPtr.Zero);
            GL.DrawArrays(BeginMode.Triangles, 0, 24*sizeof(float));
 
            GL.DisableClientState(ArrayCap.VertexArray);
 
            SwapBuffers();
        }
 
        [STAThread]
        static void Main(string[] args)
        {
            using (Game game = new Game())
            {
                game.Run(30.0);
            }
        }
 
 
    }
}