Quad texture mapping is not working...

using System;
using System.Collections.Generic;
 
using System.Drawing;
using System.Drawing.Imaging;
 
using cg;
 
using OpenTK.Graphics;
using OpenTK.Math;
 
namespace Tyrian
{
    class Background : cg.Entity, IDrawListener
    {
        const string bgImage = "data/logo.jpg";
 
        Window _window;
        Bitmap _bitmap;
        int texture;
 
        public Background() : base("bg") { }
 
        public override void Init()
        {
            GL.Enable(EnableCap.Texture2D);
            GL.Enable(EnableCap.Blend);
 
            _window = Application.GetApp().GetWindow();
 
            if (LoadTexture())            
                UploadTexture();            
            else
                throw new System.IO.FileNotFoundException(bgImage);
        }
 
        private bool LoadTexture()
        {
            if (!System.IO.File.Exists(bgImage))
                return false;
 
            _bitmap = new Bitmap(bgImage);
            return true;
        }
 
        private void UploadTexture()
        {
            texture = GL.GenTexture();
 
            BitmapData data = _bitmap.LockBits(new Rectangle(0, 0, _bitmap.Width, _bitmap.Height),
                ImageLockMode.ReadOnly, System.Drawing.Imaging.PixelFormat.Format32bppArgb);
 
            GL.TexImage2D(TextureTarget.Texture2D, 0, PixelInternalFormat.Rgba, data.Width, data.Height, 0,
                OpenTK.Graphics.PixelFormat.Bgra, PixelType.UnsignedByte, data.Scan0);
 
            _bitmap.UnlockBits(data);
 
            GL.TexParameter(TextureTarget.Texture2D, TextureParameterName.TextureMinFilter, (int)TextureMinFilter.Linear);
            GL.TexParameter(TextureTarget.Texture2D, TextureParameterName.TextureMagFilter, (int)TextureMagFilter.Linear);
        }
 
        public void Draw()
        {
            GL.Clear(ClearBufferMask.ColorBufferBit);
 
            GL.MatrixMode(MatrixMode.Modelview);
            GL.LoadIdentity();
            GL.BindTexture(TextureTarget.Texture2D, texture);
 
            GL.Begin(BeginMode.Quads);
            {
                GL.TexCoord2(0.0f, 0.0f); GL.Vertex2(0.0f, 0.0f);
                GL.TexCoord2(0.0f, 1.0f); GL.Vertex2(0.0f, 1.0f);
                GL.TexCoord2(1.0f, 0.0f); GL.Vertex2(1.0f, 1.0f); 
                GL.TexCoord2(1.0f, 0.0f); GL.Vertex2(1.0f, 0.0f);
            }
            GL.End();
        }
    }
}