// PUT api/<controller>/5
 public string Put(ReservationEnCours reserv)
 {
     if (ReservationEnCoursDAO.Update(reserv))
     {
         return("OK");
     }
     return("KO");
 }
 // POST api/<controller>
 public ReservationEnCours Post(ReservationEnCours reserv)
 {
     return(ReservationEnCoursDAO.Create(reserv));
 }