If all you want is to read the returned HTML from the web server you can use the WebClient or WebRequest classes like;
System.Net.WebRequest wrq = System.Net.WebRequest.Create("http://www.google.com");
System.Net.WebResponse wrs = wrq.GetResponse();
System.IO.Stream strm = wrs.GetResponseStream();
System.IO.StreamReader sr = new System.IO.StreamReader(strm);
string line;
while ((line = sr.ReadLine()) != null)
{
listBox1.Items.Add(line);
}
strm.Close();
Anything more than this and you will be downloading the full page and all content.