private void onSendDiscussionClicked()
    {
        GameObject gameObject = GameObject.Find("MessageText");
        InputField input      = gameObject.GetComponent <InputField> ();
        string     s1         = input.text;

        logD("AgoraRongConnect--->C#----wrapper---> " + "----message----->" + s1);
        mRtcEngine.AgoraIMSendMessage(discussionId, s1, ConversationType.DISCUSSION, userInfo);
    }