If you want something quick and dirty I would suggest using Stopwatch instead for a greater degree of precision.
Stopwatch sw = new Stopwatch(); sw.Start(); // Do Work sw.Stop(); Console.WriteLine("Elapsed time: {0}", sw.Elapsed.TotalMilliseconds); Alternatively, if you need something a little more sophisticated you should probably consider using a 3rd party profiler such as ANTS.
Here a screenshot of it showing line-by-line profiling: