소프트웨어 C# 같은데 컴파일좀 부탁합니다.

using System;
using System.Collections.Generic;
using System.Text;
using System.Net;      

namespace ConsoleApplication1
{
    class Program
    {
        static void Main(string[] args)
        {
            Console.WriteLine("내부아이피");

            IPHostEntry host = Dns.GetHostEntry(Dns.GetHostName());

            int count = host.AddressList.Length;

            for (int i = 0; i < count; i++)
            {
                Console.WriteLine("{0}. {1}",i,host.AddressList[i].ToString());
            }

            Console.WriteLine("\n외부아이피");

            WebClient wc = new WebClient();

            byte[] data = wc.DownloadData

("https://www.whatismyip.com/");

            string exten_IP = Encoding.Default.GetString(data);
            Console.WriteLine(exten_IP);
           
        }
    }
}