Issue passing a texture to shader.

private void UpdateSurfaceNoiseGPU(GameTime gameTime)
		{
			if (generateList.Count > 0 == false)
				return;

			// device
			GraphicsDevice device = game.GraphicsDevice;
			Vector2 viewportSize = new Vector2(blockWidth, blockHeight);
			
			// noise info
			Vector4 noiseInfo = generateList[0];
			int noiseWidth = (int)noiseInfo.X;
			int noiseHeight = (int)noiseInfo.Y;

			Texture2D noiseTexture = new Texture2D(device, noiseWidth, noiseHeight, 0, TextureUsage.None, SurfaceFormat.Color);
			Color[] noiseData = new Color[noiseWidth * noiseHeight];

			for(int x = 0; x < noiseWidth; x++)
			{
				for(int y = 0; y < noiseHeight; y++)
				{
					noiseData[x + y * noiseWidth] = new Color( (byte)(Util.ImageProcessing.PerlinNoise.Noise2D(x, y) * 255), 0, 0, 0 );
				}
			}

			noiseTexture.SetData<Color>(noiseData);

			// setup shader constants
			shaderGenerate.Parameters["ViewportSize"].SetValue(viewportSize);
			shaderGenerate.Parameters["Noise"].SetValue(noiseTexture);

			// draw on to surface
			for (UInt32 x = 0; x < mapBlockWidthNum; x++)
			{
				for (UInt32 y = 0; y < mapBlockHeightNum; y++)
				{
					TerrainBlock block = mapBlocks[x, y];
						// set the render target, draw and swap
					device.SetRenderTarget(0, mapSwapBlock);

					batch.Begin(SpriteBlendMode.None, SpriteSortMode.Immediate, SaveStateMode.None);
					shaderGenerate.Begin();
					shaderGenerate.CurrentTechnique.Passes[0].Begin();

					batch.Draw(block.SurfaceTexture, Vector2.Zero, Color.White);

					shaderGenerate.CurrentTechnique.Passes[0].End();
					shaderGenerate.End();
					batch.End();

					device.SetRenderTarget(0, null);

					FlipBlockBackBuffer(block);
				}
			}
			generateList.Clear();
			noiseTexture.Dispose();
			device.SetRenderTarget(0, null);
}

// SpriteBatch default variables

texture	Noise;
sampler	NoiseSampler = sampler_state { Texture = <Noise>; MipFilter = Linear; MinFilter = Linear; MagFilter = Linear; AddressU = Clamp; AddressV  = Clamp; };

// spritebatch vertex code...

void SpritePixelShader(inout float4 color : COLOR0, float2 texCoord : TEXCOORD0)
{
	float4 surface	= tex2D(TextureSampler, texCoord);
	float4 noise	= tex2D(NoiseSampler, texCoord);
	color = noise;
}