public ActionResult Save(Entidad_Materias_ModelView Model)
        {
            try
            {
                using (var db = new estudiantesEntities1())
                {
                    var tb = new Materia();

                    tb.Id_materia    = Model.Id_Materia;
                    tb.materia1      = Model.Materia1;
                    tb.creditos      = Model.Creditos;
                    tb.profesor      = Model.Profesor;
                    tb.Estudiante_Id = Model.Estudiantes_Id;



                    db.Materias.Add(tb);
                    db.SaveChanges();
                }
                return(RedirectToAction("Index", "Materia"));
            }
            catch (Exception ex)
            {
                throw new Exception(ex.Message);
            }
        }
        public ActionResult Create()
        {
            var vm = new Entidad_Materias_ModelView()
            {
                DdlMaterias = GetMaterias()
            };

            return(View(vm));
        }