//Constructor
        public ESAssistantRole(IESUnitOfWork iESUnitOfWork, IRSAssistantRole iRSAssistantRole)

        {
            this.iESUnitOfWork    = iESUnitOfWork ?? throw new ArgumentNullException(nameof(iESUnitOfWork));
            this.iRSAssistantRole = iRSAssistantRole ?? throw new ArgumentNullException(nameof(iRSAssistantRole));
        }
 public ASAttendeeRole(ICheckInRepository checkInRepository, IRSAssistantRole userServices)
 {
     this.checkInRepository = checkInRepository ?? throw new ArgumentNullException(nameof(checkInRepository));
     this.userServices      = userServices;
 }