WebExpress.TabView.WebView_FrameLoadStart C# (CSharp) Method

        private async void WebView_FrameLoadStart(object sender, FrameLoadStartEventArgs e)
        {
            await Dispatcher.BeginInvoke((Action) (() =>
            {
                try
                {
                    RefreshButton.ImageSource(StopButton);
                    refreshing = true;
                    startPage.Visibility = Visibility.Hidden;
                }
                catch (Exception ex)
                {
                    Console.WriteLine("WebView framestart error: " + ex.Message + " " + ex.Data);
                }
            }));
        }