delegate and event for mathoperation

hi,
how to perform math operations like addition, subtraction, multiplication and division using delegates and events where all operations are treated separately.
I tried like this --  here I gave Math as eventargs in delegate declaration and I created a math class which refer eventargs. but in class I am not able to write the methods for individual arithmetic operations. I want to raise an  event using Math class object.
public delegate void MathOperationHandler(object sender,Math m)
public event MathOperationHandler op
{
add
{
Events.AddHandler(key, value);
}
remove
{
Events.RemoveHandler(key, value);
}
}
public class Math : EventArgs
{
double n1 = double.MaxValue;
double n2 = double.MaxValue;
public Math(double num1, double num2)
{
this.n1 = num1;
this.n2 = num2;
}
public double num1
{
get { return num1; }

}
public double num2
{
get { return num2; }
}
}
private void RaiseEvent(Math m)
{
if (Events[key] != null)
{
(Events[key] as MathOperationHandler)(this, m);
}
}
 
 Am I doing correctly . please, help me....