static void Main(string[] args)
{
    int number, r, s;
    Console.WriteLine("Enter a number:");
    number = Convert.ToInt32(Console.ReadLine());
    s = 0;
    do
    {
        r = number % 10;
        s = s * 10 + r;
        number = number / 10;

    } while (number > 0);
    Console.WriteLine("Reverse number is:"+s);
    Console.ReadKey();

}