static void Main(string[] args)  
{  
    string _Inputstr = string.Empty, _Reversestr = string.Empty;  
    Console.Write("Enter the string : ");  
    _Inputstr = Console.ReadLine();  
    for (inti = _Inputstr.Length - 1; i >= 0; i--)  
    {  
        _Reversestr += _Inputstr[i];  
    }  
    Console.WriteLine("The reverse string is {0}", _Reversestr);  
    Console.ReadLine();  
}