public EventRegistration(EventRegistration er) : this()
{
Event_ID = er.Event_ID;
ID = er.ID;
User_ID = er.User_ID;
}
public bool IsUserRegistered(long user_id)
{
EventRegistration er = EventRegistrations.SingleOrDefault(ER => ER.User_ID == user_id);
return((er != null) || IsAccessable);
}