private void SetUpTextureAndRenderSurface()
{
   _rtsHelper = new RenderToSurface(_device, _textureWidth, _textureHeight, Format.A8R8G8B8, true, DepthFormat.D16);
   _renderTexture = new Texture(_device, _textureWidth, _textureHeight, 1, Usage.RenderTarget, Format.A8R8G8B8, Pool.Default);

   _renderSurface = _renderTexture.GetSurfaceLevel(0);
}

private void SetUpVertices()
{
   _vertices = new CustomVertex.TransformedColored[4];
   _vertices[0] = new CustomVertex.TransformedColored((float)0, height * 0.5f, 0f, 0f, Color.FromArgb(255, 0, 0).ToArgb());
   _vertices[1] = new CustomVertex.TransformedColored((float)width, height * 0.5f, 0f, 0f, Color.FromArgb(255, 0, 0).ToArgb());
   _vertices[2] = new CustomVertex.TransformedColored((float)0, height * 0f, 0f, 0f, Color.FromArgb(255, 0, 0).ToArgb());
   _vertices[3] = new CustomVertex.TransformedColored((float)width, height * 1f, 0f, 0f, Color.FromArgb(255, 0, 0).ToArgb());
}

private void SetUpBuffer()
{
   _vertexBuffer = new VertexBuffer(typeof(CustomVertex.TransformedColored), 4, _device, Usage.Dynamic | Usage.WriteOnly, CustomVertex.TransformedColored.Format, Pool.Default);
   _vertexBuffer.SetData(_vertices, 0, LockFlags.None);
}


private void RenderTexture(int orderNumber)
{
   //Render lines to texture
   _rtsHelper.BeginScene(_renderSurface);
   _device.Clear(ClearFlags.Target, Color.Black, 1.0f, 0);

   _device.SetStreamSource(0, _vertexBuffer, 0);
   _device.VertexFormat = CustomVertex.TransformedColored.Format;
           
   for (int line = 0; line < 2; line++)
   {
       _device.DrawPrimitives(PrimitiveType.LineStrip, (line * 2), 1);
   }

   _rtsHelper.EndScene(Filter.None);
   _device.Present();

   //Load texture into surface that can be locked and read from
   Surface fdbck = _device.CreateOffscreenPlainSurface(_textureWidth, _textureHeight, Format.A8R8G8B8, Pool.Scratch);

   SurfaceLoader.FromSurface(fdbck, _renderSurface, Filter.None, 0);

   //Lock texture and store values in array
   uint[,] data2 = (uint[,])fdbck.LockRectangle(typeof(uint), LockFlags.None, new int[] { _textureHeight, _textureWidth });
   int[,] values = new int[_textureWidth, _textureHeight];

   for (int j = 0; j < _textureHeight; j++)
   {
      for (int i = 0; i < _textureWidth; i++)
      {
          values[i, j] = Color.FromArgb((int)data2[j, i]).R; 
       }
   }
}