// @nuget: HtmlAgilityPack

​

using System;

using System.Xml;

using System.Linq;

using HtmlAgilityPack;

public class Program

{

    public static void Main()

    {

        var html = @"<ADRES DO ZUPY TUTAJ>";

​

        HtmlWeb web = new HtmlWeb();

​

        var htmlDoc = web.Load(html);

​

        var htmlNodes = htmlDoc.DocumentNode.SelectNodes("//div/a");

        foreach (var node in htmlNodes)

        {

            if(node.Attributes.Contains("class") && node.Attributes["class"].Value == "lightbox")

            {

                Console.WriteLine(node.Attributes["href"].Value);

            }

        }

    }

}