I don't know if it is what you want, but if you want to donwload the FULL html from a website, you can do it this way:
using System.Net;
//...
using (WebClient client = new WebClient ()) // WebClient class inherits IDisposable
{
client.DownloadFile("http://yoursite.com/page.html", @"C:\localfile.html");
// Or you can get the file content without saving it:
string htmlCode = client.DownloadString("http://yoursite.com/page.html");
}
Then you can work with the string if you want a certain part of the code. Hope it helps!!