public async Task <Administrator> AddAdministratorcAsync(Administrator admin, string firstName, string lastName, string email, string password)
{
if (GetAdministratorAsync(email, password) != null)
{
throw new ArgumentException("administator already exist");
}
if (!validator.ValidateEmail(email) || !validator.ValidatePasswordLength(password))
{
throw new ArgumentException();
}
var newAdmin = new Administrator()
{
Id = Guid.NewGuid(),
FirstName = firstName,
LastName = lastName,
Email = email,
Password = password
};
await administratorRepository.AddAdministratorAsync(admin, newAdmin);
return(newAdmin);
}