public async Task <IActionResult> DetailsAsync(int?id) { if (id == null) { return(RedirectToAction(nameof(Error), new { message = "Id mismatch" })); } var obj = await _operationService.FindByIdAsync(id.Value); if (obj == null) { return(RedirectToAction(nameof(Error), new { message = "id not found" })); } return(View(obj)); }