using System;

using System.Linq;

using System.Collections.Generic;

using System.Globalization;

using System.Threading;

public class Program

{

    public static void Main()

    {

        CultureInfo ci = new CultureInfo("da-DK");

        Thread.CurrentThread.CurrentCulture = ci;

        Thread.CurrentThread.CurrentUICulture = ci;

        var list = new List<string>{"a", "k", "c", "aa", "b"};

        // med invariant culture

        list.Sort(StringComparer.Create(CultureInfo.InvariantCulture, false));

        var listStr = string.Join(",", list);

        Console.WriteLine(listStr);

        // uden invariant culture

        list.Sort();

        var listStr2 = string.Join(",", list);

        Console.WriteLine(listStr2);

    }

}