private void ValidateData(User user)
{
Requirement.MinLength(2, user.FirstName, "FirstName");
Requirement.MaxLength(50, user.FirstName, "FirstName");
Requirement.MinLength(2, user.LastName, "LastName");
Requirement.MaxLength(50, user.LastName, "LastName");
Requirement.MinLength(2, user.Address, "Address");
Requirement.MaxLength(50, user.Address, "Address");
Requirement.Email(user.Email, "Email");
Requirement.DanishPhoneNumber(user.PhoneNumber, "PhoneNumber");
Requirement.MinLength(8, user.Password, "Password");
user.Password = Cryptography.Encrypt(user.Password);
}