using System;

using System.Collections.Generic;

using System.Globalization;

using System.Linq;

​

public class Program

{

    public static void Main()

    {

        var s = "Les Mise\u0301rables";

        var r = s.ReverseGraphemeClusters();

        Console.WriteLine(r);

    }

}

​

// From: http://stackoverflow.com/questions/228038/best-way-to-reverse-a-string

// Answer by: R. Martinho Fernandes.

public static class StringEx

{

    private static IEnumerable<string> GraphemeClusters(this string s) {

        var enumerator = StringInfo.GetTextElementEnumerator(s);

        while(enumerator.MoveNext()) {

            yield return (string)enumerator.Current;

        }

    }

    public static string ReverseGraphemeClusters(this string s) {

        return string.Join("", s.GraphemeClusters().Reverse().ToArray());

    }

}