C#开发的activex，用户控件做的。在用户控件中启动一新线程，新线程一执行WEB窗口就全关闭了。请问该怎么在activex中使用线程？

C#开发的activex，用户控件做的。在用户控件中启动一新线程，新线程一执行WEB窗口就全关闭了。请问该怎么在activex中使用线程？
javascript如下：
            function UploadFile(ctrlid0, ctrlid1, ctrlid2)
            {
                var localPath = document.getElementById(ctrlid0).value;
                var length = localPath.length;
                if (length > 0)
                {
                    var serverPath = document.getElementById(ctrlid1).value + "\\" + document.getElementById(ctrlid2).value;

                    activex.PutNewEx(localPath, serverPath);
                  __doPostBack('lnkUploadPostBack','');
                }
            }
activex函数如下：
        public void PutNewEx(string strFileName, string strRemoteName)
        {
            publicStrFileName = strFileName;
            publicStrRemoteName = strRemoteName;
            //on initialise le thread
            m_listeningThread = new Thread(new ThreadStart(PutNew));
         
            m_listeningThread.IsBackground = true;
            m_listeningThread.Start();
        }