TimeSpan stableTimeSpan = new TimeSpan(0, 0, 10);
    DateTime stableTimerStart = DateTime.Now;

    float t = (DateTime.Now.Ticks - stableTimerStart.Ticks) / (float)stableTimeSpan.Ticks;
    int test = unchecked((int)(t * 100));
    MyProgressBar.value = test;