public decimal?RetrieveExchangeRate()
{
YahooData y = new YahooData(baseCurrency, convertToCurrency);
decimal? rate = y.GetExchangeRate();
exchangeRate = rate;
return(exchangeRate);
}
public IExchangeRate GetExchangeRate()
{
YahooData y = new YahooData(baseCurrency, convertToCurrency);
decimal? rate = y.GetExchangeRate();
exchangeRate = rate;
return(this);
}