public async Task <IActionResult> Edit(Unit unit) { if (ModelState.IsValid) { try { if (!await _unitsService.UnitExists(unit.Id)) { return(NotFound()); } await _unitsService.Update(unit); } catch (DbUpdateConcurrencyException) { if (!await _unitsService.UnitExists(unit.Id)) { return(NotFound()); } else { throw; } } return(RedirectToAction(nameof(Index))); } return(View(unit)); }