using System;

public class Program

{

    public static void Main()

    {

        string str = "dlroW olleH";

        str = Reverse(str);

        Console.WriteLine(str);

    }

    public static string Reverse(string text)

    {

        if (text == null) return null;

​

       // this was posted by petebob as well 

       char[] array = text.ToCharArray();

       Array.Reverse(array);

       return new String(array);

    }

}