Timing function

timing.cs

public class DisposableStopwatch: IDisposable {
    private readonly Stopwatch sw;
    private readonly Action<TimeSpan> f;

    public DisposableStopwatch(Action<TimeSpan> f) {
        this.f = f;
        sw = Stopwatch.StartNew();
    }

    public void Dispose() {
        sw.Stop();
        f(sw.Elapsed);
    }
}
//Usage:

using (new DisposableStopwatch(t => Console.WriteLine("{0} elapsed", t)) {
  // do stuff that I want to measure
}