private void RoomSelected(User user)
 {
     LocationName = user.ToString();
 }
        private void UserSelected(User user)
        {
            var recipient = new Message.Recipient
            {
                EmailAddress = new EmailAddress
                {
                    Address = user.UserPrincipalName,
                    Name = user.DisplayName
                }
            };

            AddRecipient(recipient);
        }
        private void UserSelected(User user)
        {
            var attendee = new Attendee
            {
                EmailAddress = new EmailAddress
                {
                    Address = user.UserPrincipalName,
                    Name = user.DisplayName
                }
            };

            AddAttendee(attendee);
        }