Have a problem with texturing

        private void LoadPicture()
        {
 
 
            //bitmap1.MakeTransparent(Color.White);
            //texture = texturearray[0];
 
            GL.Enable(EnableCap.Texture2D);
            GL.Enable(EnableCap.Blend);
 
            GL.Hint(HintTarget.PerspectiveCorrectionHint, HintMode.Nicest);
 
            GL.GenTextures(1,out texture);
            //GL.BindTexture(TextureTarget.Texture2D, texture);
            BitmapData data = bitmap1.LockBits(new Rectangle(0, 0, bitmap1.Width, bitmap1.Height),
                ImageLockMode.ReadOnly, System.Drawing.Imaging.PixelFormat.Format32bppArgb);
 
            GL.TexImage2D(TextureTarget.Texture2D, 0, PixelInternalFormat.Rgba, data.Width, data.Height, 0,
                OpenTK.Graphics.OpenGL.PixelFormat.Bgra, PixelType.UnsignedByte, data.Scan0);
 
            bitmap1.UnlockBits(data);
 
            GL.TexParameter(TextureTarget.Texture2D, TextureParameterName.TextureMinFilter, (int)TextureMinFilter.Linear);
 
 
            GL.TexImage2D(TextureTarget.Texture2D, 0, PixelInternalFormat.Rgba, data.Width, data.Height, 0,
                      OpenTK.Graphics.OpenGL.PixelFormat.Bgra, PixelType.UnsignedByte, data.Scan0);
        }

private void glControl1_Paint(object sender, PaintEventArgs e)
        {
            GL.ClearColor(Color.Green);
            GL.Clear(ClearBufferMask.DepthBufferBit | ClearBufferMask.ColorBufferBit);
            GL.MatrixMode(MatrixMode.Texture);
 
            GL.LoadIdentity();
 
 
            GL.Enable(EnableCap.Texture2D);
 
            GL.BindTexture(TextureTarget.Texture2D, texture);
 
            //label1.Text = texture.ToString();
 
            //label2.Text = bitmap1.RawFormat.ToString();
            GL.Begin(BeginMode.Quads);
            {
 
 
                GL.TexCoord2(0, 0);
                GL.Vertex3(0, 0, 0);
 
                GL.TexCoord2(1, 0);
                GL.Vertex3(256, 0, 0);
 
                GL.TexCoord2(1, 1);
                GL.Vertex3(256, 256, 0);
 
                GL.TexCoord2(0, 1);
                GL.Vertex3(0, 256, 0);
            }
            GL.End();
 
            GL.Disable(EnableCap.Texture2D);
            glControl1.SwapBuffers();
 
        }