public ActionResult BookUpdate(int id, Book newBook)
{
var book = books.Where(b => b.id == id).FirstOrDefault();
if (book==null) throw new Exception("Book does not exist");
books.Remove(book);
books.Add(newBook);
return Json(newBook);
}
public ActionResult BookCreate(Book book)
{
book.id = GetNextId();
books.Add(book);
return Json(book);
}