public async Task <IActionResult> ElGradebookTeacherAdd(int elGradebookId)
        {
            var elGradebook = await _elGradebookRepository.GetElGradebookAsync(elGradebookId);

            if (elGradebook == null)
            {
                return(NotFound());
            }

            var elGradebookTeacher = new ElGradebookTeacher {
                ElGradebookId = elGradebookId,
                ElGradebook   = elGradebook
            };

            ViewBag.Teachers = _selectListRepository.GetSelectListAppUsersTeachers();

            return(View(elGradebookTeacher));
        }
        public async Task <IActionResult> ElGradebookTeacherRemove(ElGradebookTeacher elGradebookTeacher)
        {
            await _elGradebookRepository.RemoveElGradebookTeacher(elGradebookTeacher);

            return(RedirectToAction(nameof(ElGradebookTeachers), new { elGradebookTeacher.ElGradebookId }));
        }