public void AddFacebookEvent(string facebookId)
{
if (FacebookEvents.Any(c => c.FacebookId == facebookId))
{
throw new FacebookEventAlreadyExistsException(facebookId);
}
FacebookEvents.Add(FacebookEvent.Create(facebookId));
}
public void RemoveFacebookEvent(string facebookEventId)
{
var ev = FacebookEvents.SingleOrDefault(c => c.FacebookId == facebookEventId);
FacebookEvents.Remove(ev);
}