public int RegisterNewClient(ClientRegistrationInfo args)
{
var entityToAdd = (new ClientEntity()
{
RegistationDateTime = DateTime.Now,
Name = args.Name,
Phone = args.Phone,
Balance = 0M
});
if (clientTableRepository.Contains(entityToAdd))
{
throw new ArgumentException("This client has been already registered");
}
clientTableRepository.Add(entityToAdd);
clientTableRepository.SaveChanges();
return(entityToAdd.Id);
}