Reverse String without using Reverse() Function

class Program
{
    static void Main(string[] args)
    {
        string strInput = string.Empty;
        string strRev = string.Empty;
        Console.WriteLine("Enter String");
        strInput = Console.ReadLine();
        for (int i = strInput.Length-1; i >= 0; i--)
        {
            strRev += strInput[i];
        }
        Console.WriteLine("Reverse string : {0}",strRev);
        Console.ReadLine();
    }
}