Well you would handle the MouseClick event, get the mouse position, use that to load the bitmap and get the pixels value, and then store it in a database using the ADO.Net connectivity.
If you don't know where to start on any of this then I'd recommend getting a good beginners book and starting with that rather than diving into something very complicated. However if you are stuck on just a part of the process then tell us what your problem is and we'll try to help with that specific part.
/- Sam Judson : Wrox Technical Editor -/
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