public Member(Contact contact, LicensePlate licensePlate, DateTime registrationDate, MemberShipLevel.Level memberShipLevel = Domain.MemberShipLevel.Level.Bronze)
{
if (contact == null)
{
throw new ValidationException <Member>("contact is required");
}
if (licensePlate == null)
{
throw new ValidationException <Member>("licensePlate is required");
}
if (default(DateTime) == registrationDate)
{
throw new ValidationException <Member>("registrationDate is required");
}
this.Contact = contact;
this.LicensePlate = licensePlate;
this.RegistrationDate = registrationDate;
this.MemberShipLevel = memberShipLevel;
}