public Money Convert(string targetCurrency)
{
double rate;
// currency value validation here:
if (string.IsNullOrWhiteSpace(targetCurrency) == true && targetCurrency.Length != 3)
{
CustomExceptions.ExceptionThrower.ThrowImproperValueForCurrency();
}
if (this.Currency.Equals("USD") == false && targetCurrency.ToUpper().Equals("USD") == false)
{
throw new Exception("Either of two currencies must be USD!!");
}
if (this.Currency.Equals("USD"))
{
FileExchangeRateProvider provideExchangeRate = new FileExchangeRateProvider();
rate = provideExchangeRate.GetExchangeRate(this.Currency, targetCurrency.ToUpper());
return(new Money(this.Amount * rate, targetCurrency.ToUpper()));
}
else
{
FileExchangeRateProvider provideExchangeRate = new FileExchangeRateProvider();
rate = provideExchangeRate.GetExchangeRate(targetCurrency.ToUpper(), this.Currency);
if (this.Amount == 0)
{
return(new Money(0, targetCurrency.ToUpper()));
}
return(new Money(this.Amount / rate, targetCurrency.ToUpper()));
}
}
