public ActionResult Create(Material material)
 {
     if (ModelState.IsValid)
     {
         _materialDbContext.dbSet.Add(material);
         _materialDbContext.SaveChanges();
         return RedirectToAction("Index");
     }
     return View(material);
 }
 public ActionResult Edit(Material material)
 {
     if (ModelState.IsValid)
     {
         _materialDbContext.Entry(material).State = EntityState.Modified;
         _materialDbContext.SaveChanges();
         return RedirectToAction("Index");
     }
     return View(material);
 }