public async Task <IActionResult> Edit(Specialty specialty)
 {
     if (ModelState.IsValid)
     {
         try
         {
             await _specialtyRepository.UpdateAsync(specialty);
         }
         catch (DbUpdateConcurrencyException)
         {
             if (!await _specialtyRepository.ExistAsync(specialty.Id))
             {
                 return(NotFound());
             }
             else
             {
                 throw;
             }
         }
         return(RedirectToAction(nameof(Index)));
     }
     return(View(specialty));
 }