bridge-net-v1-12-released-sample9.cs

// We need the Timer reference to have access to it in the callback
public static Timer timer;

// A flag of changing the Timer's due time and period
public static bool timerChanged;

public static void Main()
{
// The Timer callback
TimerCallback callback = (state) =>
{
    // We passed the stopwatch to the Timer's constructor
    // So, we can access it within the callback
    Stopwatch stopwatch = state as Stopwatch;
    var seconds = stopwatch.Elapsed.Seconds;

    Console.WriteLine(seconds);

    if (!App.timerChanged && seconds >= 5 && seconds < 10)
    {
        App.timerChanged = true;

        // Changes the Timer's due time and period
        timer.Change(2000, 2000);
    }

    if (seconds >= 10)
    {
        // Stops and disposes the Timer
        App.timer.Dispose();
        Console.WriteLine("The Timer has been disposed.");
    }
};

// The stopwatch to monitor the executions of the callback
var sw = new Stopwatch();

sw.Start();

// The amount of time to wait before the first execution of the callback
var dueTime = 0;

// The amount of time to wait between subsequent executions of the callback
var period = 1000;

// We should keep the reference to the Timer,
// to be able to access within the callback
App.timer = new Timer(callback, sw, dueTime, period);