public ActionResult Edit(EditProductGroupManagementPostRequest group)
 {
     if (ModelState.IsValid)
     {
         bool isSuccess = service.UpdateProductGroup(group.ConvertToProductGroupViewModel());
         if (isSuccess)
         {
             return(RedirectToAction("Index"));
         }
         else
         {
             ModelState.AddModelError("ServerError", "Update group fail!");
         }
     }
     return(View(group.ConvertToProductGroupViewModel()));
 }