public SalaryValidator()
{
Func <ISalary, bool> nameValidation = x => !string.IsNullOrEmpty(x.FirstName) || !string.IsNullOrEmpty(x.LastName);
FluentValidator.RuleFor(x => x.FirstName)
.Must((instance, _) => nameValidation(instance))
.WithMessage(Resources.NameValidationErrorText);
FluentValidator.RuleFor(x => x.LastName)
.Must((instance, _) => nameValidation(instance))
.WithMessage(Resources.NameValidationErrorText);
FluentValidator.ObjectRule(x => nameValidation(x) ? null : Resources.NameValidationErrorText);
FluentValidator.RuleFor(x => x.BirthDate).NotEmpty().WithName(Resources.BirthDateText);
}