public async Task <bool> CreateRegistrationForEvent(int eventId, int userId)
{
Event item = await eventRepository.ReadAsync(eventId);
// if max number of registrations has been reached
if (item.EventRegistrations.Count() >= item.MaxRegistrations)
{
return(false);
}
// create new registration
Registration newRegistration = new Registration
{
UserId = userId,
EventId = eventId
};
// save registration
await eventRepository.CreateRegistrationForEvent(newRegistration);
return(true);
}