public async Task <IActionResult> Create(MainPage mainpage, IFormFile file)
        {
            if (ModelState.IsValid)
            {
                if (file != null)
                {
                    mainpage.Videocode = await _upload.Create(_env.WebRootPath, file, "File", "video", mainpage.Videocode);
                }
                var result = await _context.AddAsync(mainpage);

                await _context.SaveChangesAsync();
            }
            return(RedirectToAction("Index"));
        }