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);