website Crawling code for naver.com by c#

using System;
using System.Net;
using System.IO;
using System.Text.RegularExpressions;
 
class Program {
    static void Main(string[] args) {
        string url = "https://www.naver.com";
        HttpWebRequest request = (HttpWebRequest)WebRequest.Create(url);
        HttpWebResponse response = (HttpWebResponse)request.GetResponse();
        StreamReader stream = new StreamReader(response.GetResponseStream());
        string html = stream.ReadToEnd();
        stream.Close();
        response.Close();
 
        Regex regex = new Regex(@"(?<=<a href="")[^""]+(?="")");
        MatchCollection matches = regex.Matches(html);
        foreach (Match match in matches) {
            Console.WriteLine(match.Value);
        }
    }
}