public ActionResult UpdateBook(Book model)
        {
            ViewData["CategoryID"] = new SelectList(
                //db.Categories.ToList()
                categoryConcrete.GetCategoryList()
                .Select(x => new
            {
                x.CategoryID,
                x.CategoryName
            }), "CategoryID", "CategoryName");

            ViewData["AuthorID"] = new SelectList(
                //db.Authors.ToList()
                authorConcrete.GetAuthorList()
                .Select(x => new {
                x.AuthorID,
                AuthorName = x.FirstName + " " + x.LastName
            })
                , "AuthorID", "AuthorName");

            ViewData["StatusID"] = new SelectList(
                //db.Statuses.ToList()
                statusConcrete.GetStatusList()
                .Select(x => new
            {
                x.StatusID,
                x.StatusName
            }), "StatusID", "StatusName");

            if (Request.Files.Count > 0 && Request.Files[0].ContentLength > 0)
            {
                try
                {
                    var    file = Request.Files[0];
                    string pic  = System.IO.Path.GetFileName(file.FileName);
                    string path = System.IO.Path.Combine(
                        Server.MapPath("~/img/Books"), pic);
                    // file is uploaded
                    file.SaveAs(path);
                    model.ImageUrl = "~/img/Books/" + pic;
                }
                catch (Exception ex)
                {
                    ModelState.AddModelError("Error", "Resim yüklenemiyor!" + ex.Message);

                    return(View(model));
                }
            }

            if (false && !ModelState.IsValid)
            {
                ModelState.AddModelError("Error", "Bir hata oluştu!");

                return(View(model));
            }
            else
            {
                try
                {
                    //repBook.Update(model);
                    //uow.SaveChanges();
                    bookConcrete.Update(model);

                    return(RedirectToAction("MyBooks"));
                }
                catch (Exception ex)
                {
                    ModelState.AddModelError("Error", ex);

                    return(View(model));
                }
            }
        }