Introduction

I have used Visual Studio 2012 for debugging purpose. But you can use any version of visul studio as per your availability..

using System;
public class StringExercise
{
    public static void Main()
    {
        string str;
        int length = 0;
 
        Console.Write("Enter the string : ");
        str = Console.ReadLine();
 
        length  = str.Length - 1;
        Console.Write("The characters of the string in reverse are : \n");
        while (length >= 0)
        {
            Console.Write("{0} ", str[length]);
            length--;
        }
        Console.ReadLine();
    }
}

Result