Logout from Facebook

gistfile1.txt

        private void ClearFacebookCookies()
        {
            LoadCompletedEventHandler loadCompleted = null;
            WebBrowser browser = new WebBrowser();
            loadCompleted = (sndr, evt) =>
            {
                if (
                    browser.SaveToString().Contains("logout_form"))
                {
                    browser.InvokeScript("eval", "document.forms['logout_form'].submit();");
                    //AppSettings.FacebookAccessKey = null;
                    //RaisePropertyChanged("LoggedIntoFacebook");
                    browser.Visibility = Visibility.Collapsed;
                    browser.LoadCompleted -= loadCompleted;
                }
            };

            browser.LoadCompleted += loadCompleted;
            browser.Navigate(new Uri("https://www.facebook.com/logout.php"));
        }