Inheritance: INotifyPropertyChanged
        private void ContactSelected(Contact contact)
        {
            var attendee = new Attendee
            {
                EmailAddress = contact.EmailAddresses[0]
            };

            AddAttendee(attendee);
        }
 private void ContactSelected(Contact contact)
 {
     AddRecipient(new Message.Recipient
     {
         EmailAddress = contact.EmailAddresses[0]
     });
 }
        private async Task SetContactPhoto(Contact contact)
        {
            var photoData = await GraphService.GetContactPhoto(contact.Id);

            var photo = await UI.BytesToPhoto(photoData);

            if (photo != null)
            {
                contact.Photo = photo;
                contact.NotifyPropertyChanged("Photo");
            }
        }