static void Main(string[] args)
{
CalculateWithEvent myCalculate = new CalculateWithEvent();
EventListener myListener = new EventListener(myCalculate);
myCalculate.Add(2, 3);
myCalculate.Sub(3, 2);
Console.Read();
}
public EventListener(CalculateWithEvent calculateCase)
{
CalculateCase = calculateCase;
CalculateCase.Calculate += new CalculateEventHandler(CalculateCase_Calculate);
}