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C#: Drawing an inverse rectangle

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Does anyone know how in C#, I can draw an empty rectangle that will render over the existing graphics with the inverse colour? With the C++ Win32 API, I do this with SetROP2(Dc,R2_NOT); then the normal MoveToEx() and LineTo() functions. Is there an equivalent in C#? I'm trying to implement a click-drag selection box. Searched all through the help and internet to no avail. Thanks. [EDIT] Never mind. Apparently, you can't.

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