Install-Package HtmlAgilityPack

// From File

var doc = new HtmlDocument();

doc.Load(filePath);

// From String

var doc = new HtmlDocument();

doc.LoadHtml(html);

// From Web

var url = "http://html-agility-pack.net/";

var web = new HtmlWeb();

var doc = web.Load(url);

// With XPath

var value = doc.DocumentNode

    .SelectNodes("//td/input")

    .First()

    .Attributes["value"].Value;

// With LINQ

var nodes = doc.DocumentNode.Descendants("input")

    .Select(y => y.Descendants()

    .Where(x => x.Attributes["class"].Value == "box"))

    .ToList();

HtmlWeb webClient = new HtmlWeb();

HtmlDocument doc = webClient.Load("http://www.cnsos.net/weburl/");

HtmlNodeCollection hrefList = doc.DocumentNode.SelectNodes(".//a[@href]");

if (hrefList != null)

{

    foreach (HtmlNode href in hrefList)

    {

        HtmlAttribute att = href.Attributes["href"];

        Console.WriteLine(att.Value);

    }

}