HAP

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.Web;
using System.Net;
using HtmlAgilityPack;

namespace VK
{
    class Program
    {
        static void Main(string[] args)
        {
            HtmlWeb htmlWeb = new HtmlWeb();
            HtmlDocument doc = htmlWeb.Load("http://vk.com/id1");
            HtmlNodeCollection links = doc.DocumentNode.SelectNodes("//a[@href]");
            foreach (HtmlNode link in links)
            {
                Console.WriteLine(link.Attributes["href"].Value);
            }
            Console.ReadKey();
        }
    }
}