c# - Edit two models -

in event controllers edit parameter of event model on user model.

the value in controllers corrects. value of event model save

in event model have among other things :

    public guid? userid { get; set; }     public virtual user user_ss { get; set; }    [httppost] [validateantiforgerytoken] public actionresult achat( event @event) { if (modelstate.isvalid)         {              db.entry(@event).state = entitystate.unchanged;             @event.nbpartid = @event.nbpartid - @event.nbformid;                var c = (@event.budget * (@event.nbformid));               var userprofiluser = (from s in db.users                                       s.personemail.contains(user.identity.name)                                     select s).tolist();             db.entry(db.users.find(userprofiluser[0].userid)).state = entitystate.unchanged;              var p = (userprofiluser[0].wallet) - c;             db.entry(db.users.find(userprofiluser[0].userid)).state = entitystate.modified;              db.entry(@event).state = entitystate.modified;             db.savechanges();