/// <summary>Cancel.In returns a new `Cancel` with its `Now` already scheduled to be called in `fromNow` duration.</summary>
/// <param name="fromNow"></param>
public static Cancel In(TimeSpan fromNow)
{
Cancel me = new Cancel();
Timer timer = new Timer(fromNow.TotalMilliseconds);
timer.AutoReset = false;
timer.Elapsed += (evtsender, evtargs) => {
timer.Stop();
timer.Close();
timer.Dispose();
me.Now();
};
timer.Start();
return(me);
}