Memory leak with this code

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I am not the greatest at COM Interop. I understand cleaning up your resources, but usually I am using a VS generated interop library, or primary interop assemblies. Making API Calls is somewhat new to me.

Could someone please explain to me why the code at http://www.wischik.com/lu/Programmer/1bpp would leak memory and how to fix it. It is not my site, but we used it as an example.
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