public IActionResult AddOrEdit(int id, [Bind("UserId,Name,BirthDate,Gender")] UserViewModel userViewModel)
 {
     if (ModelState.IsValid)
     {
         _operations.AddOrEdit(_configuration.GetConnectionString("ConnectionString"), userViewModel.Name, userViewModel.BirthDate, userViewModel.Gender, id);
         return(RedirectToAction(nameof(Index)));
     }
     return(View(userViewModel));
 }