public async Task <BrowserResult> InvokeAsync(BrowserOptions options)
        {
            using (var form = _formFactory.Invoke())
                using (var browser = new ExtendedWebBrowser()
                {
                    Dock = DockStyle.Fill
                })
                {
                    var signal = new SemaphoreSlim(0, 1);

                    var result = new BrowserResult
                    {
                        ResultType = BrowserResultType.UserCancel
                    };

                    form.FormClosed += (o, e) =>
                    {
                        signal.Release();
                    };

                    browser.NavigateError += (o, e) =>
                    {
                        e.Cancel          = true;
                        result.ResultType = BrowserResultType.HttpError;
                        result.Error      = e.StatusCode.ToString();
                        signal.Release();
                    };

                    browser.BeforeNavigate2 += (o, e) =>
                    {
                        if (e.Url.StartsWith(options.EndUrl))
                        {
                            e.Cancel          = true;
                            result.ResultType = BrowserResultType.Success;
                            if (options.ResponseMode == OidcClientOptions.AuthorizeResponseMode.FormPost)
                            {
                                result.Response = Encoding.UTF8.GetString(e.PostData ?? new byte[] { }).Trim('\0');
                            }
                            else
                            {
                                result.Response = e.Url;
                            }
                            signal.Release();
                        }
                    };

                    form.Controls.Add(browser);
                    browser.Show();

                    System.Threading.Timer timer = null;

                    form.Show();
                    browser.Navigate(options.StartUrl);

                    await signal.WaitAsync();

                    if (timer != null)
                    {
                        timer.Change(Timeout.Infinite, Timeout.Infinite);
                    }

                    form.Hide();
                    browser.Hide();

                    return(result);
                }
        }
 public ExtendedWebBrowserEventHelper(ExtendedWebBrowser parent)
 {
     this.parent = parent;
 }