using System;

using System.Collections.Generic;

using System.Linq;

​

public class Program

{

    public static void Main()

    {

        var start = DateTime.Now;

        var myList = new List<string>() { "scus", "nbergesen", "dev9b", "dev2b" };

        myList.Contains("dev2b");

        var end = DateTime.Now;

        Console.WriteLine($"List: {end.Subtract(start).TotalMilliseconds} ms");

        start = DateTime.Now;

        var myHashSet = new HashSet<string>() { "scus", "nbergesen", "dev9b", "dev2b" };

        myHashSet.Contains("dev2b");

        end = DateTime.Now;

        Console.WriteLine($"HashSet: {end.Subtract(start).TotalMilliseconds} ms");

    }

}