public static List <EventAttendee> convertPersonToAttendee(IList <string> UUIDS) { List <EventAttendee> attendees = new List <EventAttendee>(); foreach (var person in Attendee.IgetAllAttendees()) { foreach (var uuid in UUIDS) { if (person.UserDefined[0].Value == uuid) { attendees.Add(new EventAttendee() { Email = person.EmailAddresses[0].Value }); Console.WriteLine(person.EmailAddresses[0].Value.ToString()); } } } return(attendees); }