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Managed DX - C# - Pixel collision

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Hello, I need to return the pixel color of my backbuffer from a given x,y position, but I don't have a clue how to do it. well, I know I have to get the buffer from the device: Surface s = myDXDevice.GetBackBuffer(); And then lock the surface and use pointers... but how? This is C#. Thank you

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copying the backbuffer from the GPU is going to be expensive. The solution is to just not do it! If you want pixel perfect collision in 2D space, I suggest you do a simple bounding box collision test and then do a more accurate pixel collision if necessary. You don't want to be polling the backbuffer at runtime.

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