using System;

using System.Collections.Generic;

using System.Linq;

public class Program

{

    public static void Main()

    {

         List<string> unOrderedList = new List<string>() { "bAC", "ABC", "aBc", "abc", "cAb", "Abx", "bbc", "bBx", "cAA" };

        Console.WriteLine("List  Before Sort : {0}" , String.Join("\n", unOrderedList));

        var orderedList = unOrderedList.OrderBy(x => x[0]).ThenBy(y=>y[1]).ToList();

        Console.WriteLine("List  After Sort : {0}" , String.Join("\n", orderedList));

    }

}