using System;

​

namespace dowhile_statement

{

    public class Program

    {

        public static void Main(string[] args)

        {

            int i = 1;

            //increment each row

            do

            {

                Console.WriteLine("{0}", new String('*', i));

                i++;

            } while (i < 10);

​

            //decrement each row

            do

            {

                Console.WriteLine("{0}", new String('*', i));

                i--;

            } while (i > 0);

​

            Console.ReadLine();

        }

    }

}