Bench Marking finding dups

BenchMarkingFindingDups.cs

void Main()
{
	List<PlugIn> plugIns =  new List<PlugIn> ();
	//Create some plugins 
	var keys = Enumerable.Range(0,100).Select(e => Guid.NewGuid().ToString()).ToArray();
	for (int i = 0; i < 1000000; i++)
	{
		plugIns.Add(new PlugIn(keys[new Random().Next(keys.Length-1)],"Some thing",Console.WriteLine));		
	}
	
	Stopwatch watch = new Stopwatch ();
	watch.Start();
		
	var duplicates = plugIns.GroupBy(i => i.ID)
				   .Where(g => g.Count() > 1)
				   .ToDictionary(g => g.Key, g => g.Select(a => a.Description).ToList());
				   
	watch.Stop();
	
	watch.ElapsedMilliseconds.Dump("Previous time");
	
	Stopwatch w = new Stopwatch ();
	
	w.Start();
	
	var hasDup = plugIns.ToLookup(plugIn => plugIn.ID).Count != plugIns.Count;
	
	w.Stop();
	
	w.ElapsedMilliseconds.Dump("Time after refactoring");
}

class PlugIn
{
	public string ID { get; set; }
	public string Description { get; set; }
	public Action DoThis { get; set;}

	public PlugIn(string id, string des, Action act)
	{
		ID  = id;
		Description = des;
		DoThis = act;
	}
}
// Define other methods and classes here