private void Whois_Start_button_Click(object sender, RoutedEventArgs e) { if (Whois_tab_control.Startparsing(new Action(SetEndWhoisParse))) { Whois_Cancel_button.IsEnabled = true; Whois_Start_button.Visibility = Visibility.Collapsed; Whois_Pause_button.Visibility = Visibility.Visible; } }