protected void Check()
        {
            string _myTicket = "";
            if (System.Web.HttpContext.Current.Session[this.SessionName] != null)
            {
                _myTicket = System.Web.HttpContext.Current.Session[this.SessionName].ToString();
            }
            if (_myTicket != "")
            {
                // 初始化保存当前在线用户的信息的datatable.
                DataTableForCurrentOnlineUser _onlinetable = new DataTableForCurrentOnlineUser();

                // 当页面更新或获得请求时刷新时间.
                _onlinetable.RefreshTime(_myTicket);
                Response.Write("OK:" + DateTime.Now.ToString());
            }
            else
            {
                Response.Write("Sorry:" + DateTime.Now.ToString());
            }
        }
        protected void Check()
        {
            string _myTicket = "";

            if (System.Web.HttpContext.Current.Session[this.SessionName] != null)
            {
                _myTicket = System.Web.HttpContext.Current.Session[this.SessionName].ToString();
            }
            if (_myTicket != "")
            {
                // 初始化保存当前在线用户的信息的datatable.
                DataTableForCurrentOnlineUser _onlinetable = new DataTableForCurrentOnlineUser();

                // 当页面更新或获得请求时刷新时间.
                _onlinetable.RefreshTime(_myTicket);
                Response.Write("OK:" + DateTime.Now.ToString());
            }
            else
            {
                Response.Write("Sorry:" + DateTime.Now.ToString());
            }
        }
        protected void Check()
        {
            string _myTicket = "";

            if (System.Web.HttpContext.Current.Session[this.SessionName] != null)
            {
                _myTicket = System.Web.HttpContext.Current.Session[this.SessionName].ToString();
            }
            if (_myTicket != "")
            {
                // Initialize the datatable which used to store the information of
                // current online user.
                DataTableForCurrentOnlineUser _onlinetable = new DataTableForCurrentOnlineUser();

                // Update the time when the page refresh or the page get a request.
                _onlinetable.RefreshTime(_myTicket);
                Response.Write("OK:" + DateTime.Now.ToString());
            }
            else
            {
                Response.Write("Sorry:" + DateTime.Now.ToString());
            }
        }