public ActionResult Create(StudentModels studentmodels)
        {
            if (ModelState.IsValid)
            {
                db.Students.Add(studentmodels);
                db.SaveChanges();
                return RedirectToAction("Index");
            }

            ViewBag.TeacherId = new SelectList(db.Teachers, "TeacherId", "TeacherName", studentmodels.TeacherId);
            return View(studentmodels);
        }
 public ActionResult Edit(StudentModels studentmodels)
 {
     if (ModelState.IsValid)
     {
         db.Entry(studentmodels).State = EntityState.Modified;
         db.SaveChanges();
         return RedirectToAction("Index");
     }
     ViewBag.TeacherId = new SelectList(db.Teachers, "TeacherId", "TeacherName", studentmodels.TeacherId);
     return View(studentmodels);
 }