int DisplayNumber(int x) {
    System.Console.WriteLine(String.Format("{0}",x));
    return x;
}

delegate int MyDelegate();
event MyDelegate myEvent;

int i;

// Add some handlers
i=5;
myEvent += delegate (int x) { return DisplayNumber(x+i); };
i=3;
myEvent += delegate (int x) { return DisplayNumber(x+i); };

// Remove a handler
myEvent -= delegate (int x) { return DisplayNumber(x+3); };

myEvent();