private void OnWebsocketMessage(object sender, AudioStreamTextArgs e)
 {
     if (e.Message.flag == "1")
     {
         RT_FullSentence.Invoke(new UpdateContent(UpdateLongText), e.Message.body);
     }
     else
     {
         RT_ShortSentence.Invoke(new UpdateContent(UpdateShortText), e.Message.body);
     }
 }
 private void UpdateLongText(string text)
 {
     RT_FullSentence.AppendText(String.Format(" {0}", text));
     // scroll it automatically
     RT_FullSentence.ScrollToCaret();
 }