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static class BenchmarkExtension {

    public static void Times(this int times, string description, Action action) {
        Stopwatch watch = new Stopwatch();
        watch.Start();
        for (int i = 0; i < times; i++) {
            action();
        }
        watch.Stop();
        Console.WriteLine("{0} ... Total time: {1}ms ({2} iterations)", 
            description,  
            watch.ElapsedMilliseconds,
            times);
    }
}


var randomStrings = Enumerable.Range(0, 10000)
    .Select(_ => Guid.NewGuid().ToString())
    .ToArray();

50.Times("Add 10,000 random strings to a Dictionary", 
    () => {
        var dict = new Dictionary<string, object>();
        foreach (var str in randomStrings) {
            dict.Add(str, null);
        }
    });

50.Times("Add 10,000 random strings to a SortedList",
    () => {
        var list = new SortedList<string, object>();
        foreach (var str in randomStrings) {
            list.Add(str, null);
        }
    });