how to set timer interval for daily in windows service

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C#

I created windows service for auto mail triggering, Initially i set timer interval for every one minute, On elapsed event is triggered for every minute my mail part also working fine.

But i want the mail will trigger every day, for that i set timer interval is 1000*60*60*24, but the event not raised.

Below is the code:

protected override void OnStart(string[] args)
{
TraceService("start service");

//handle Elapsed event
timer.Elapsed += new ElapsedEventHandler(OnElapsedTime);

//This statement is used to set interval to 1 minute (= 60,000 milliseconds)
// timer = new System.Timers.Timer();
timer.Interval = 1000*60*60*24;

//enabling the timer
timer.Enabled = true;
timer.AutoReset = true;
timer.Start();


}






private void TraceService(string content)
{
//set up a filestream
FileStream fs = new FileStream(@"d:\ScheduledService.txt", FileMode.OpenOrCreate, FileAccess.Write);

//set up a streamwriter for adding text
StreamWriter sw = new StreamWriter(fs);

//find the end of the underlying filestream
sw.BaseStream.Seek(0, SeekOrigin.End);

//add the text
sw.WriteLine(content);

//add the text to the underlying filestream
sw.Flush();

//close the writer
sw.Close();
}