whois client

HomeController.cs

using System;
using System.Collections.Generic;
using System.IO;
using System.Linq;
using System.Net.Sockets;
using System.Text;
using System.Threading.Tasks;
using Microsoft.AspNet.Mvc;

namespace WebApplication1.Controllers
{
    public class HomeController : Controller
    {
        private const int WhoisServerDefaultPortNumber = 43;
        private const string DomainRecordType = "domain";
        private const string DotComWhoisServer = "whois.verisign-grs.com";

        public IActionResult Index()
        {
            return View();
        }

        public string Look(string id)
        {
            return Lookup(id);
        }

        private static string Lookup(string domainName)
        {
            using (TcpClient whoisClient = new TcpClient())
            {
                whoisClient.Connect(DotComWhoisServer, WhoisServerDefaultPortNumber);

                string domainQuery = DomainRecordType + " " + domainName + "\r\n";
                byte[] domainQueryBytes = Encoding.ASCII.GetBytes(domainQuery.ToCharArray());

                Stream whoisStream = whoisClient.GetStream();
                whoisStream.Write(domainQueryBytes, 0, domainQueryBytes.Length);

                StreamReader whoisStreamReader = new StreamReader(whoisClient.GetStream(), Encoding.ASCII);

                string streamOutputContent = "";
                List<string> whoisData = new List<string>();
                while (null != (streamOutputContent = whoisStreamReader.ReadLine()))
                {
                    whoisData.Add(streamOutputContent);
                }

                //whoisClient.Close();

                return String.Join(Environment.NewLine, whoisData);
            }
        }
    }
}