1 using System;
  2 using System.Collections.Generic;
  3 using System.Linq;
  4 using System.Text;
  5 using System.Threading.Tasks;
  6 
  7 namespace HelloWorld01
  8 {
  9     class Program
 10     {
 11         static void Main(string[] args)
 12         {
 13             Console.WriteLine("Hello World!");
 14             Console.ReadKey();
 15         }
 16     }
 17 }