My friend made MATH.ddl in which has a function named SUM(int x, int y) (I just khow the function and its parameters, I don't know the entails code in it). On a nice day, I want to override the function SUM(x,y) of my friend (not make a new dll), just to hide my friend function by my function SUM(x,y) ver 2.0 (^ ^).How can I do that?

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