public ActionResult Delete(int id, FormCollection collection)
        {
            try
            {
                GestionnaireGererTva GesTva = new GestionnaireGererTva();
                GesTva.Supprimer(id);

                return RedirectToAction("Index");
            }
            catch
            {
                return View();
            }
        }
        public ActionResult Create(FormCollection collection)
        {
            try
            {
                int codeAdd = Convert.ToInt32(collection["Code"]);
                decimal tauxAdd = Convert.ToDecimal(collection["Taux"]);
                Tva AddTva = new Tva() {Code = codeAdd, Taux = tauxAdd};
                GestionnaireGererTva GesTva = new GestionnaireGererTva();
                GesTva.CreerTva(AddTva);

                return RedirectToAction("Index");
            }
            catch
            {
                return View();
            }
        }
        public ActionResult Edit(int id, FormCollection collection)
        {
            try
            {
                int codeEdit = Convert.ToInt32(collection["Code"]);
                decimal tauxedit = Convert.ToDecimal(collection["Taux"]);
                Tva EditTva = new Tva() { Code = codeEdit, Taux = tauxedit };
                GestionnaireGererTva GesTva = new GestionnaireGererTva();
                GesTva.MettreAJourTva(EditTva);

                return RedirectToAction("Index");
            }
            catch
            {
                return View();
            }
        }
 // GET: Tva/Edit/5
 public ActionResult Edit(int id)
 {
     GestionnaireGererTva GesTva = new GestionnaireGererTva();
     Tva TvaById = GesTva.RechercherTva(id);
     return View(TvaById);
 }
 // GET: Tva
 public ActionResult Index()
 {
     GestionnaireGererTva GesTva = new GestionnaireGererTva();
     ICollection<Tva> CollecTva = new Collection<Tva>();
     CollecTva = GesTva.ChargerLesTvas();
     return View(CollecTva);
 }