using System; using System.Collections.Generic;

class Program { static void Main(string[] args) { List<string> l = new List<string>();

    l.Add("c12three");
    l.Add(String.Empty);
    l.Add("5six7");
    l.Add("_score");
    l.Add("zounds");
    l.Add(null);
    l.Add("#pound1");
    l.Add("#pound2");
    l.Add("apple");

    l.Sort(new Comparison<string>(SortByString));

    foreach(string s in l)
    {
        Console.WriteLine(s);
    }

    Program.ConsoleKey();
}

static void ConsoleKey()
{
    Console.WriteLine(
        string.Format("{0}Press any key to continue...",
        Environment.NewLine));

    Console.ReadKey(false);

}

private static int SortByString(string s1, string s2)
{
    return String.Compare(s1,s2);
}  

}