public IActionResult upDate(int id, StudentEditModelAdd model) { if (ModelState.IsValid) { var student = _repositoryStudent.GetStudentById(id); if (student == null) { return(RedirectToAction(nameof(Index))); } student.Name = model.Name; _repositoryStudent.upDate(student); return(RedirectToAction(nameof(Details), new { student.id })); } else { return(RedirectToAction(nameof(Index))); } }