public async Task <IActionResult> Create([Bind("BookId,Title,Author,CopyrightYear,ISBN,ImageUrl")] Book book)
        {
            if (ModelState.IsValid)
            {
                _context.Add(book);
                await _context.SaveChangesAsync();

                return(RedirectToAction(nameof(Index)));
            }
            return(View(book));
        }
        public async Task <IActionResult> Create(Sale sale)
        {
            //sale.Book = _context.Books.Find(sale.Book.BookId);
            if (ModelState.IsValid)
            {
                sale.Member = _context.Members.Find(_userManager.GetUserId(User));
                sale.Book   = _context.Books.Find(sale.Book.BookId);
                sale.Id     = 0;
                _context.Add(sale);
                await _context.SaveChangesAsync();

                return(RedirectToAction(nameof(Index)));
            }
            return(View(sale));
        }