/// <summary>
        /// Called when Excel starts the RTD server.
        /// </summary>
        /// <param name="callbackObject">The call back object.</param>
        /// <returns>Status code.</returns>
        int Excel.IRtdServer.ServerStart(Microsoft.Office.Interop.Excel.IRTDUpdateEvent callbackObject)
        {
            // Store the callback object.
            m_callback = callbackObject;

            // Initialise and start the timer.
            m_timer          = new System.Timers.Timer(1000);
            m_timer.Elapsed += TimerElapsed;
            m_timer.Start();
            return(1);
        }
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        // This will be called just after the constructor. We need to cache the
        // IRTDUpdateEvent reference. We'll also setup a timer (with a 1000
        // millisecond interval) to trigger the simulated data updates. Finally,
        // return 1 if all is OK.
        public int ServerStart(
            Microsoft.Office.Interop.Excel.IRTDUpdateEvent CallbackObject)
        {
            xlUpdateEvent = CallbackObject;

            timer           = new Timer(1000);
            timer.AutoReset = true;
            timer.Elapsed  += new ElapsedEventHandler(TimerEventHandler);

            return(1);
        }