private bool Validate()
{
Log.Debug($"Rate: {Rate}, SourceCurrency: {SourceCurrency}, TargetCurrency: {TargetCurrency}");
ErrorMessages.Clear();
Validator.AddExchangeRate(ErrorMessages, Rate);
Validator.AddExchangeRateSourceCurrency(ErrorMessages, SourceCurrency);
Validator.AddExchangeRateTargetCurrency(ErrorMessages, TargetCurrency);
Validator.AddExchangeRateCurrency(ErrorMessages, SourceCurrency, TargetCurrency);
return(ErrorMessages.Count == 0);
}