requete sql sous Linq SQL

je veux traduire cette requette sql

Code:

---

(select * from salle where idSalle not in (select IdSalle from Reservation as rs, reunion as rn where rn.IdReunion=rs.IdReunion and rn.dateDebut betwen maReunion.dateDebut and maReunion.dateDebut.addSegende((int)maReuion.durree));

---

en Linq sql sous dot net