Reverse a String Without Using Function in C#

using System;

using System.Collections.Generic;

using System.Linq;

using System.Text;

namespace ConsoleApplication1

{

    class Program

    {

        static void Main(string[] args)

        {

            string str, revstr="";

            int l;

            Console.WriteLine("enter astring:");

            str = Console.ReadLine();

            l = str.Length-1;

            while (l >= 0)

            {

                revstr = revstr + str[l];

                l--;

            }

            Console.WriteLine("Reverse String is :: {0}" ,revstr);

            Console.ReadLine();

        }

    }

}

output