19) where R(t) is the cumulative interest rate from time 0 to time t, so that dt / dR ) t ( R ?
By requiring that an option symbol be passed to the constructor method, we prevent ourselves, or any other programmer using this class, from creating a new option object without a symbol. Also notice that we can get the value of strOptionSymthrough the public property Symbol, which has a Get method within it. Public properties provide us with access to private member variables through Get and Set methods.
Or a shorter-term chart may display so much volatility that any entry becomes a dangerous enterprise.