Link: HTML Agility Pack (.NET)

The HTML Agility Pack is an HTML parser for .NET, supporting XPATH and XSLT parsing. Basically the HTML equivalent of XmlDocument.

Example use (from site):

HtmlDocument doc = new HtmlDocument();
doc.Load("file.htm");
foreach(HtmlNode link in doc.DocumentElement.SelectNodes("//a[@href]")
{
    HtmlAttribute att = link["href"];
    att.Value = FixLink(att);
}
doc.Save("file.htm");

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