Error in the application

using System;
using System.Drawing;
using System.Collections;
using System.ComponentModel;
using System.Windows.Forms;
using System.Data;
using Microsoft.DirectX;
using Microsoft.DirectX.Direct3D;

namespace RailwaySimulator
{
    public partial class Form1_railwaySimulator : Form
    {
        private Device m_device = null;
        Button btnStart = new Button();
        //Button btnStop = new Button();
        private VertexBuffer m_vb = null;
        private IndexBuffer m_ib = null;
        float MIN_BOX_Z = -10.0f;
        float MAX_BOX_Z = 10.0f;
        float angle, speedIncrement;
        private static readonly short[] indices = 
		{
                0,1,2,1,3,2,  //FRONT
			    7,4,6,7,5,4,  //BACK
                5,7,3,2,5,3,  //LEFT
                0,4,1,1,4,6,  //RIGHT
                7,6,1,7,1,3,  //BOTTOM
                0,4,2,2,4,5  //TOP
        };

        void InitGraphics()
        {
            PresentParameters presentParams = new PresentParameters();
            presentParams.Windowed = true;
            presentParams.SwapEffect = SwapEffect.Discard;
            m_device = new Device(0, DeviceType.Hardware, this, CreateFlags.SoftwareVertexProcessing, presentParams);
        // m_vb =new VertexBuffer(typeof(cusomt
            m_vb = new VertexBuffer(typeof(CustomVertex.PositionColored), 8,m_device, Usage.Dynamic | Usage.WriteOnly, CustomVertex.PositionColored.Format, Pool.Default);
            CustomVertex.PositionColored[] verts = new CustomVertex.PositionColored[8];
            m_vb.Created += new EventHandler(this.CreateVertexBuffer);
            CreateVertexBuffer(m_vb, null);
            m_ib = new IndexBuffer(typeof(short), indices.Length, m_device, Usage.WriteOnly, Pool.Default);
            m_ib.Created += new EventHandler(this.OnIndexBufferCreate);
            OnIndexBufferCreate(m_ib, null);

        }

        private void OnIndexBufferCreate(object sender, EventArgs e)
        {
            IndexBuffer buffer = (IndexBuffer)sender;
            buffer.SetData(indices, 0, LockFlags.None);
        }

        protected override void OnPaint(PaintEventArgs e)
        {
            m_device.Clear(ClearFlags.Target,
                  Color.PowderBlue, 1.0f, 0);
            SetupCamera();
            m_device.BeginScene();
            m_device.SetStreamSource(0, m_vb, 0);
            m_device.VertexFormat = CustomVertex.PositionColored.Format;
            drawTrain(4, 3, 8,
                       0.0f, 0.0f, 0.0f, // yaw = y-axis, pitch = X-axis
                       2.0f, 1.0f, 2.0f);
            m_device.EndScene();
            m_device.Present();
            // Always re-paint the window.
            this.Invalidate();

        }

        protected void CreateVertexBuffer(object sender, EventArgs e)
        {
            VertexBuffer vb = (VertexBuffer)sender;
            //m_vb = new VertexBuffer(typeof(CustomVertex.PositionColored), 8,m_device, Usage.Dynamic | Usage.WriteOnly, CustomVertex.PositionColored.Format, Pool.Default);
            CustomVertex.PositionColored[] verts = new CustomVertex.PositionColored[8];

            // Define 36 triangle corners.
            // Front
            verts[0] = new CustomVertex.PositionColored(
                new Vector3(-1.0f, 1.0f, 1.0f),
                Color.Red.ToArgb());
            verts[1] = new CustomVertex.PositionColored(
                new Vector3(-1.0f, -1.0f, 1.0f),
                Color.Yellow.ToArgb());
            verts[2] = new CustomVertex.PositionColored(
                new Vector3(1.0f, 1.0f, 1.0f),
                Color.Green.ToArgb());
            verts[3] = new CustomVertex.PositionColored(
                new Vector3(1.0f, -1.0f, 1.0f),
                Color.Orange.ToArgb());
            verts[4] = new CustomVertex.PositionColored(
                new Vector3(-1.0f, 1.0f, -1.0f),
                Color.Black.ToArgb());
            verts[5] = new CustomVertex.PositionColored(
                new Vector3(1.0f, 1.0f, -1.0f),
                Color.Blue.ToArgb());
            verts[6] = new CustomVertex.PositionColored(
                new Vector3(-1.0f, -1.0f, -1.0f),
                Color.Indigo.ToArgb());
            verts[7] = new CustomVertex.PositionColored(
                new Vector3(1.0f, -1.0f, -1.0f),
                Color.Aqua.ToArgb());

            m_vb.SetData(verts, 0, LockFlags.None); //y loclflags

        }
        private void SetupCamera()
        {
            m_device.Transform.Projection = Matrix.PerspectiveFovLH((float)Math.PI / 4, this.Width / this.Height, 1.0f, 100.0f);
            m_device.Transform.View = Matrix.LookAtLH(new Vector3(0, 0, 5.0f), 
                                                      new Vector3(),
                                                      new Vector3(0, 1, 0));
            m_device.RenderState.PointSize = 3.0f;
            m_device.RenderState.Lighting = false;
            m_device.RenderState.Ambient = Color.AntiqueWhite;
         }

        public Form1_railwaySimulator()
        {
            btnStart.Location = new Point(10, 10);
            btnStart.Text = "Start";
            //this.Controls.Add(btnStart);

            InitializeComponent();
            this.SetStyle(ControlStyles.AllPaintingInWmPaint | ControlStyles.Opaque, true);
        }

        private float F(float x, float z) // Function to set the path on SIN form
        {
            return (float)((Math.Sin(x) + Math.Sin(z)) * 1.5);
        }
        
       private void drawTrain(float scaleX, float scaleY, float scaleZ,
                                float yaw, float pitch, float roll,
                                float x, float y, float z)
        {
           
            angle += 0.1f;
            speedIncrement += 0.01f;

            Vector3 direction = new Vector3(0.0f, 0.0f, 0.0f);
            Vector3 vectorA, vectorB, newPosition;
            vectorA = new Vector3(x, 0, z);
            if (z < MIN_BOX_Z || (direction.Z <= 0 && z <= MAX_BOX_Z))
            {
                z -= speedIncrement;//forward

            }
            else
            {
                z += speedIncrement;//backward
            }
            vectorB = new Vector3(0, 0, z);

            direction = vectorA - vectorB;
            Vector3.Normalize(direction);
            newPosition = vectorA + (direction * speedIncrement);
            //device.Transform.World = Matrix.Translation(x * angle * 0.2f, y, z);
             m_device.Transform.World = Matrix.Translation(F(x, z), y, z * angle * 0.1f);
            
   m_device.DrawIndexedPrimitives(PrimitiveType.TriangleList, 0, 0, 8, 
               0,indices.Length/3);
            
        }

        static void Main()
        {
            using (Form1_railwaySimulator frm = new Form1_railwaySimulator())
            {
                frm.Show();
                frm.InitGraphics();
                Application.Run(frm);
            }
        }


    }
}