AcManager.Pages.Dialogs.AppKeyDialog.AppKeyDialogViewModel.TestValue C# (CSharp) Метод

            private async void TestValue() {
                var testN = ++_testN;

                if (string.IsNullOrWhiteSpace(Value)) {
                    IsValueAcceptable = true;
                    CheckingInProgress = false;
                    return;
                }

                CheckingInProgress = true;
                InternetConnectionRequired = false;

                await Task.Delay(50);
                if (testN != _testN) return;

                var value = await InternalUtils.CheckKeyAsync(Value, CmApiProvider.UserAgent);
                if (testN != _testN) return;

                CheckingInProgress = false;

                if (value.HasValue || OptionOfflineMode) {
                    IsValueAcceptable = value ?? true;
                } else {
                    InternetConnectionRequired = true;
                    IsValueAcceptable = false;

                    if (_attemptsCounter == 1) {
                        OfflineModeAvailable = true;
                    }
                }
            }