public IEnumerable <ModelValidationResult> Validate()
{
var balanceResult = Balance.ValidateMoney(nameof(Balance));
if (balanceResult != null)
{
yield return(balanceResult);
}
var dateResult = CreationDate.ValidateDateTime(nameof(CreationDate));
if (dateResult != null)
{
yield return(dateResult);
}
var accountTypeResult = AccountType.ValidateAccountType(nameof(AccountType));
if (accountTypeResult != null)
{
yield return(accountTypeResult);
}
}