public ActionResult Create(Article article)
 {
     if (ModelState.IsValid)
     {
         db.Articles.Add(article);
         db.SaveChanges();
         return RedirectToAction("Index");
     }
     ViewBag.TagId = new SelectList(db.Tags, "TagId", "title", article.TagId);
     return View(article);
 }
 public ActionResult Edit(Article article)
 {
     if (ModelState.IsValid)
     {
         db.Entry(article).State = EntityState.Modified;
         db.SaveChanges();
         return RedirectToAction("Index");
     }
     return View(article);
 }