public ActionResult Videos(int?id)
        {
            CoursesSingleViewModel model;

            if (id != null)
            {
                Curso curso = db.Cursos.Find(id);
                if (curso == null)
                {
                    return(HttpNotFound());
                }

                model = new CoursesSingleViewModel()
                {
                    CursoActual = curso,
                    Cursos      = db.Cursos.ToList(),
                    SelectedID  = id
                };
            }
            else
            {
                model = new CoursesSingleViewModel()
                {
                    CursoActual = null,
                    Cursos      = db.Cursos.ToList(),
                    SelectedID  = null
                };
            }
            return(View(model));
        }
        // GET: Cursoes/Details/5
        public ActionResult Details(int?id)
        {
            if (id == null)
            {
                return(new HttpStatusCodeResult(HttpStatusCode.BadRequest));
            }
            Curso curso = db.Cursos.Find(id);

            if (curso == null)
            {
                return(HttpNotFound());
            }
            CoursesSingleViewModel model = new CoursesSingleViewModel()
            {
                CursoActual = curso,
                Cursos      = db.Cursos.ToList(),
                SelectedID  = id
            };

            return(View(model));
        }// GET: Cursoes/Details/5