public async Task <IActionResult> Create([Bind("Bid,Btitle,Category,Price,Authorname,publisher,Releasedate")] Book book)
        {
            if (ModelState.IsValid)
            {
                _context.Add(book);
                await _context.SaveChangesAsync();

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