Programatically making a Web Request

Scenario:
You want to read a web-page or file programatically.

Code:

private void AccessWeb(string siteURL) {
WebRequest request = WebRequest.Create(siteURL);
request.Credentials = CredentialCache.DefaultCredentials;
request.Method = "GET";

WebResponse response = request.GetResponse();
response.Close();
}

Also you can use HTTPWebRequest object

private void GetBookReview(object sender, EventArgs e)
  {
   StringBuilder sb = new StringBuilder();

   try
   {
    string request = "http://xml.amazon.com/onca/xml2?" +
     "t=webservices-20&dev-t=[D1LKOL21AANCMO]&"+
     "AsinSearch=" + textBoxASIN.Text + 
     "&mode=books&type=heavy&page=1&f=xml";

    HttpWebRequest req = (HttpWebRequest)WebRequest.Create(request);
    HttpWebResponse resp = (HttpWebResponse)req.GetResponse();

    StreamReader s = new StreamReader
     (resp.GetResponseStream(),Encoding.ASCII);
   
    XmlDocument doc = new XmlDocument();
    doc.LoadXml(s.ReadToEnd());

    s.Close();

    sb.Append("<HR><TABLE width='95%' align='center'>");

    XmlNode salesRankNode = doc.SelectSingleNode("//SalesRank");
    if(salesRankNode!=null)
     sb.AppendFormat("<B>Sales Rank: {0}</B><BR><BR>",salesRankNode.InnerText);

    XmlNodeList customerReviewNodes = doc.SelectNodes("//CustomerReview");
    if(customerReviewNodes.Count>0)
    {
     foreach(XmlNode reviewNode in customerReviewNodes)
     {
      sb.AppendFormat("<B><U>Review (Rating {0}): {1}</U></B><BR>",
       reviewNode.ChildNodes[0].InnerText,
       reviewNode.ChildNodes[1].InnerText);
      sb.AppendFormat("<I>{0}</I><BR><BR>",
       reviewNode.ChildNodes[2].InnerText);
     }
    }

    sb.Append("</DIV>");
    sb.Append("</TABLE>");
   }
   catch(Exception ex)
   {
    throw new Excepion("Sorry, unable to retrieve the books!");
   }
}