AdventureWorks.UILogic.ViewModels.SignInFlyoutViewModel.SignInAsync C# (CSharp) Метод

        public async Task SignInAsync()
        {
            var signinCallFailed = false;
            var signinSuccessfull = false;
            try
            {
                signinSuccessfull = await _accountService.SignInUserAsync(UserName, Password, SaveCredentials);
            }
            catch (Exception ex)
            {
                if (ex.HResult != Error401)
                {
                    signinCallFailed = true;
                }
            }

            if (signinCallFailed)
            {
                await _alertMessageService.ShowAsync(_resourceLoader.GetString("ErrorServiceUnreachable"), _resourceLoader.GetString("Error"));
                return;
            }

            if (signinSuccessfull)
            {
                IsSignInInvalid = false;

                if (_successAction != null)
                {
                    _successAction();
                    _successAction = null;
                }

                CloseFlyout();
            }
            else
            {
                IsSignInInvalid = true;
            }
        }
    }