public async Task<IActionResult> ChangePassword(ChangePasswordViewModel model)
 {
     if (!ModelState.IsValid)
     {
         return View(model);
     }
     var user = await GetCurrentUserAsync();
     if (user != null)
     {
         var result = await _userManager.ChangePasswordAsync(user, model.OldPassword, model.NewPassword);
         if (result.Succeeded)
         {
             await _signInManager.SignInAsync(user, isPersistent: false);
             _logger.LogInformation(3, "User changed their password successfully.");
             return RedirectToAction(nameof(Index), new { Message = ManageMessageId.ChangePasswordSuccess });
         }
         AddErrors(result);
         return View(model);
     }
     return RedirectToAction(nameof(Index), new { Message = ManageMessageId.Error });
 }