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Using an HttpWebRequest to post data to a remote Web page (C#)

<%@ Page Language="C#" %> <%@ Import Namespace="System.IO" %> <%@ Import Namespace="System.Net" %> <!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd"> <script runat="server">     protected void Page_Load(object sender, EventArgs e)     {         Uri uri = new Uri("http://www.amazon.com/");         string data = "";         if (uri.Scheme == Uri.UriSchemeHttp)         {             HttpWebRequest request = (HttpWebRequest)HttpWebRequest.Create(uri);             request.Method = WebRequestMethods.Http.Post;             request.ContentLength = data.Length;             request.ContentType = "application/x-www-form-urlencoded";             StreamWriter writer = new StreamWriter(request.GetRequestStream());             writer.Write(data);             writer.Close();             HttpWebResponse response = (HttpWebResponse)request.GetResponse();             StreamReader reader = new StreamReader(response.GetResponseStream());             string tmp = reader.ReadToEnd();             response.Close();             this.Panel1.GroupingText = tmp;         }     } </script> <html xmlns="http://www.w3.org/1999/xhtml" > <head runat="server">     <title>Untitled Page</title> </head> <body>     <form id="form1" runat="server">     <div>         <asp:Panel ID="Panel1" runat="server"             Height="355px" Width="480px" ScrollBars="Auto">         </asp:Panel>          </div>     </form> </body> </html>