PerfTimer using using.

Using.PerfTimer.cs

class Program
{  
  static void Main()  
  {
    using (new PerfTimer())
    {
      // Do your thing.
    }  
  }
}

class PerfTimer : IDisposable
{  
  private readonly Stopwatch _ = new Stopwatch();  

  public PerfTimer()
  {    
    _.Start();
  }  

  public void Dispose() 
  {
    _.Stop();
    Console.WriteLine("Spent {0} ms.", _.ElapsedMilliseconds);  
  }
}