While designing a windows service if you are planning to use a timer control, make sure not use the System.Windows.Forms.Timer. The timer event will not tick. You have to use the System.Timers.Timer , which will work properly. I came to know about this after developing a windows service using the timer control. Also System.Threading might help, thoguh I have not tried this. private static System.Timers.Timer tmr;

    public AlertService()
    {
        InitializeComponent();
        tmr = new System.Timers.Timer(30* 60000);
    }

    protected override void OnStart(string[] args)
    {
        try
        {
            //Attach the elaspsed event of the timer
            //Set the interval of timer to 30 minute and enable the timer.

            tmr.Elapsed += new System.Timers.ElapsedEventHandler(tmr_Elapsed);
            tmr.Interval = 30* 60000;
            tmr.Enabled = true;
        }
        catch (Exception eg)
        {
             //your log
         }
    }

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