public WindowMain() { Browser browser = BrowserFactory.Create(); browserView = new WPFBrowserView(browser); browser.FinishLoadingFrameEvent += delegate(object sender, FinishLoadingEventArgs e) { if (e.IsMainFrame) { DOMDocument document = e.Browser.GetDocument(); DOMInputElement firstName = (DOMInputElement)document.GetElementByName("firstName"); DOMInputElement lastName = (DOMInputElement)document.GetElementByName("lastName"); DOMInputElement agreement = (DOMInputElement)document.GetElementByName("agreement"); firstName.Value = "John"; lastName.Value = "Doe"; agreement.Checked = true; } }; Content = browserView; Width = 1024; Height = 768; this.Loaded += WindowMain_Loaded; }