implementation of steganography in HTML

WebRequest request = WebRequest.Create(URL);
request.Credentials = CredentialCache.DefaultCredentials;
HttpWebResponse response = (HttpWebResponse)request.GetResponse();
Stream dataStream = response.GetResponseStream();
StreamReader reader = new StreamReader(dataStream);
string responseFromServer = reader.ReadToEnd();
reader.Close();
dataStream.Close();
response.Close();

//reads the html into an html document to enable parsing 
IHTMLDocument2 doc = (IHTMLDocument2)new HTMLDocument();
doc.write(new object[] { responseFromServer });
doc.close();

//loops through each element in the document
foreach (IHTMLElement el in (IHTMLElementCollection)doc.all)
{
    string ThisTag = el.tagName;

//check your capitalization here, etc.