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

namespace ConsoleApplication1
{
    class Program
    {
        static void Main(string[] args)
        {
            string quit = "no";

            while(quit != "yes")
            {
                Console.WriteLine("Hello World");

                Console.Write("Do you want to quit? (yes) ");
                quit = Console.ReadLine();          // Read text
            }

            Console.ReadKey(); // Pause
        }
    }
}