I have a timer in my code and the interval is 10s

When the timer elapsed, I will do some checking, and it may takes more than 10s for checking and some update jobs.

However, if I didn't stop the timer, seems the checking will execute every 10s ... If I call the stop(), seems the timer cannot be start again ... ie something like:

    protected void timer_elapsed(object sender, EventArgs args) 
    {
        __timer.Stop();
        //Some checking here more than 10s
        __timer.Start();
    }

I just want another 10s to check again after the before checking is done. anyone can help?