Get error message from ModelState in c# mvc

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public async Task<JsonResult> SignIn(UserLoginViewModel model)
     {
       if (!ModelState.IsValid)
      {        
      _returnModel.Message  = ModelState.FirstOrDefault(x=>x.Value.Errors.Any()).Value.Errors.FirstOrDefault().ErrorMessage;
       return Json(_returnModel);
        }
     return Json(_returnModel);
  }

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