Write palindrome in C#

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;

namespace Palindrome
{
    class Program
    {
        static void Main(string[] args)
        {
            string str = string.Empty;

            Console.WriteLine("Enter a String");

            string s = Console.ReadLine();

            int i = s.Length;
            //we can get the Length of string by using Length Property

            for (int j = i - 1; j >= 0; j--)
            {
                str = str + s[j];
            }
            if (str == s)
            {

                Console.WriteLine(s + " is palindrome");

            }
            else
            {
                Console.WriteLine(s + " is not a palindeome");
            }

            Console.WriteLine(str);

            Console.Read();

        }
    }
}