public async Task <IActionResult> Create(BannerQuangCao bannerQuangCao, IFormFile Ffile)
        {
            if (ModelState.IsValid)
            {
                string s = "";
                if (Ffile != null)
                {
                    string fileName = $"{DateTime.Now.Ticks}{Ffile.FileName}";
                    s = fileName;
                    bannerQuangCao.LinkBanner = s;
                    string fullPath = Path.Combine(Directory.GetCurrentDirectory(), "wwwroot", "user", "banner", fileName);

                    using (var file = new FileStream(fullPath, FileMode.Create))
                    {
                        Ffile.CopyTo(file);
                    }
                }
                else
                {
                    bannerQuangCao.LinkBanner = "macdinh.jpg";
                }
                _context.Add(bannerQuangCao);
                await _context.SaveChangesAsync();

                return(RedirectToAction(nameof(Index)));
            }
            return(View(bannerQuangCao));
        }
        public async Task <IActionResult> Edit(int id, BannerQuangCao bannerQuangCao, IFormFile Ffile)
        {
            if (ModelState.IsValid)
            {
                try
                {
                    string s = "";
                    if (Ffile != null)
                    {
                        string fileName = $"{DateTime.Now.Ticks}{Ffile.FileName}";
                        s = fileName;
                        bannerQuangCao.LinkBanner = s;
                        string fullPath = Path.Combine(Directory.GetCurrentDirectory(), "wwwroot", "user", "banner", fileName);

                        using (var file = new FileStream(fullPath, FileMode.Create))
                        {
                            Ffile.CopyTo(file);
                        }
                    }
                    else
                    {
                        bannerQuangCao.LinkBanner = "macdinh.jpg";
                    }
                    bannerQuangCao.MaBanner = id;
                    _context.Update(bannerQuangCao);
                    await _context.SaveChangesAsync();
                }
                catch (DbUpdateConcurrencyException)
                {
                    if (!BannerQuangCaoExists(bannerQuangCao.MaBanner))
                    {
                        return(NotFound());
                    }
                    else
                    {
                        throw;
                    }
                }
                return(RedirectToAction(nameof(Index)));
            }
            return(View(bannerQuangCao));
        }