Reverse a string using recursion

 Hellow Friends,
                                Now I am going to describe  how to reverse a string with using  recursion function.
using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;

namespace recersfunction
{
    class recursionstring
    {
   public void reversestring(string str)
  {
    if(str.Length > 0) 
      reversestring(str.Substring(1, str.Length-1));
    else 
     return;
  }
}


class program {
    static void Main(string[] args)
    {
      string str, Revstr = "";
      int length;
      Console.Write("Please Enter Your string : ");
      str = Console.ReadLine();
      length = str.Length - 1;
      while (length >= 0)
      {
          Revstr = Revstr + str[length];
          length--;
      }
      Console.WriteLine("Your revrse string value is {0}", Revstr);
      recursionstring obj = new recursionstring();
      obj.reversestring(str);
      Console.ReadLine();
  }
}
}

I have explained reverse a string using recursion  function.

So after read please Comments and suggestions.

Thanks & Regard

Rabi