定时器.ElapsedEventHandler函数未触发

static  System.Timers.Timer _timer;
    static string _ScheduledRunningTime ="6:00 AM";
    static void Main(string[] args)
        {
        try
            {
            _timer = new System.Timers.Timer(6000);
            _timer.Elapsed += new System.Timers.ElapsedEventHandler(timer_Elapsed);
            _timer.Enabled = true;
            _timer.Start();
            }
        catch (Exception ex)
            {
            //Displays and Logs Message
            _loggerDetails.LogMessage = ex.ToString();
            _writeLog.LogDetails(_loggerDetails.LogLevel_Error, _loggerDetails.LogMessage);
            }
        }
    static void timer_Elapsed(object sender, ElapsedEventArgs e)
        {
        string _CurrentTime=String.Format("{0:t}", DateTime.Now);
        if (_CurrentTime == _ScheduledRunningTime)
            {
            ExtractDataFromSharePoint();
            }
        }

这是我的代码，我无法确定为什么timer_Elapsed Method没有触发，我在这段代码中做错了什么。