C# Timer Interval Every 24 Hours

Question

I'm following a tutorial on how to create a Windows Service that will send automated emails on my web server. I've got the tutorial working, however, the example code executes the service every 60mins, instead, I'd like the service executed once a day, every 24 hours, say at 9am every morning.

Below is the sample code

    private Timer scheduleTimer = null;
    private DateTime lastRun;
    private bool flag;

    public StarEmailService()
    {
        InitializeComponent();
        if (!System.Diagnostics.EventLog.SourceExists("EmailSource"))
        {
            System.Diagnostics.EventLog.CreateEventSource("EmailSource", "EmailLog");
        }
        eventLogEmail.Source = "EmailSource";
        eventLogEmail.Log = "EmailLog";

        scheduleTimer = new Timer();
        scheduleTimer.Interval = 1 * 5 * 60 * 1000;
        scheduleTimer.Elapsed += new ElapsedEventHandler(scheduleTimer_Elapsed);

    }

    protected override void OnStart(string[] args)
    {
        flag = true;
        lastRun = DateTime.Now;
        scheduleTimer.Start();
        eventLogEmail.WriteEntry("Started");
    }

    protected void scheduleTimer_Elapsed(object sender, ElapsedEventArgs e)
    {
        if (flag == true)
        {
            ServiceEmailMethod();
            lastRun = DateTime.Now;
            flag = false;
        }
        else if (flag == false)
        {
            if (lastRun.Date < DateTime.Now.Date)
            {
                ServiceEmailMethod();
            }
        }
    }

The line scheduleTimer.Interval = 1 * 5 * 60 * 1000; appears to be the code which sets the interval to 60mins, however, am unsure what would I need to amend this to in order to make it run every 24 hours at 9am?

Any advice would be appreciated.

Thanks.

Answer 1

You have couple of options:

• Use Quartz .NET
• Use Windows Schedule tasks

Don't rely on other timers as they will get out of sync in (near) future.