public ActionResult Edit([Bind(Include="ID,Name,CategoriesID,Author,Introduce,imagePath,pubYear")] Book book)
{
if (ModelState.IsValid)
{
db.Entry(book).State = EntityState.Modified;
db.SaveChanges();
return RedirectToAction("Index");
}
ViewBag.CategoriesID = new SelectList(db.Categories, "ID", "Name", book.CategoriesID);
return View(book);
}