public ActionResult Edit(Client c)
        {
            if (ModelState.IsValid)
            {
                if (CVM.ExistDataBase(c))
                {
                    ModelState.AddModelError("name", "Este cliente ya existe");
                    return(View(c));
                }
                else
                {
                    CVM.Edit(c);
                    return(RedirectToAction("Index"));
                }
            }

            return(View(c));
        }