/// <see cref="PersonDAL.GetPersonOfDoctorByVisit(Visit)"/>
 public Person GetDoctorByVisitID(Visit visit)
 {
     if (visit == null || visit.ID == null)
     {
         throw new ArgumentNullException("visit and its id cannot be null");
     }
     return(PersonDAL.GetPersonOfDoctorByVisit(visit));
 }