using System;

using System.Text;

using System.Linq;

using System.Collections.Generic;

public class Program

{

//https://stackoverflow.com/questions/11313205/generate-a-unique-id

​

    public static void Main()

    {

/*

        for (int i = 0; i<=10;i++)      

            Console.WriteLine(i + " " + YouTube(11));

*/

        var myList = YouTube(2, 11);

        foreach (string v in myList)

            Console.WriteLine(v);

    }

​

    public static List<string> YouTube(int NumberOfResults, int GuidLength)

    {

        string guid;

        var GuidList = new List<string>();

        var newGuid = new HashSet<string>();

        do{

            guid = YouTube(GuidLength);

            if (newGuid.Add(guid))

            {

                GuidList.Add(guid);

            }

        } while (GuidList.Count() != NumberOfResults);

        return GuidList;

    }

​

    private static string YouTube(int length)

    {

        StringBuilder builder = new StringBuilder();

        Enumerable

            .Range(65, 26)

            .Select(e => ((char)e).ToString())

            .Concat(Enumerable.Range(97, 26).Select(e => ((char)e).ToString()))

            .Concat(Enumerable.Range(0, 10).Select(e => e.ToString()))

            .OrderBy(e => Guid.NewGuid())

            .Take(length)

            .ToList().ForEach(e => builder.Append(e));

        return(builder.ToString());

    }

}