How do I adjust the screen brightness in C#?
Look at the SetDeviceGammaRamp API function. There's a CodeProject article that describes using it from C# here: Setting Screen Brightness in C#
Be aware that your graphics card has to support this though, I'd assume that most modern ones do, but I don't know.
Edit: Since the CodeProject article seems to be down, another place to find out how to call it from C# is on the pInvoke site.
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