public async Task <IActionResult> Editar(Comic comic)
        {
            if (!ModelState.IsValid)
            {
                return(View(comic));
            }
            _repo.Editar(comic);
            try
            {
                await _repo.EditarAsync();
            }
            catch (DbUpdateConcurrencyException)
            {
                if ((await ComicExisteAsync(comic.Id)) == false)
                {
                    return(NotFound());
                }
                else
                {
                    throw;
                }
            }

            return(RedirectToAction("Index"));
        }