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private void Button_Click(object sender, RoutedEventArgs e)
{
TimeSpan timespan = new TimeSpan();
DispatcherTimer timer = new DispatcherTimer();
timer.Interval = new TimeSpan(0, 0,1);
timer.Start();
timer.Tick += new EventHandler(new Action<object, EventArgs>((b, m) =>
{
timespan += timespan + new TimeSpan(0, 0, 1);
if (timespan.Seconds >= 20)
{
MessageBox.Show("fgdfdffg");
}
}));
}