public async Task<ActionResult> Edit(Department dept)
 {
     if (ModelState.IsValid)
     {
         db.Entry(dept).State = EntityState.Modified;
         await db.SaveChangesAsync();
         return RedirectToAction("Index");
     }
     return View(dept);
 }
 public async Task<ActionResult> Create(Department dept)
 {
     if (ModelState.IsValid)
     {
         db.Departments.Add(dept);
         await db.SaveChangesAsync();
         return RedirectToAction("Index");
     }
     return View(dept);
 }