how to find entire links of a website C#.net

Here's an example straight from their examples page on how to find all the links in a page

I'd look at using the Html Agility Pack.

 HtmlWeb hw = new HtmlWeb();
 HtmlDocument doc = hw.Load(/* url */);
 foreach(HtmlNode link in doc.DocumentElement.SelectNodes("//a[@href]"))
 {

 }