Retrieve web page : WebClient « Development « ASP.NET Tutorial

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ASP.NET Tutorial » Development » WebClient 
9.46.4.Retrieve web page
<%@ Page Language="C#" AutoEventWireup="true" CodeFile="Default.aspx.cs" Inherits="GetBookImage" %>

<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.1//EN" "http://www.w3.org/TR/xhtml11/DTD/xhtml11.dtd">

<html xmlns="http://www.w3.org/1999/xhtml" >
<head runat="server">
    <title>Untitled Page</title>
</head>
<body>
    <form id="form1" runat="server">
    <div>
    
    </div>
    </form>
</body>
</html>

File: Default.aspx.cs

using System;
using System.Data;
using System.Configuration;
using System.Collections;
using System.Web;
using System.Web.Security;
using System.Web.UI;
using System.Web.UI.WebControls;
using System.Web.UI.WebControls.WebParts;
using System.Web.UI.HtmlControls;
using System.Text.RegularExpressions;
using System.Net;
using System.IO;

public partial class GetBookImage : System.Web.UI.Page
{
    protected void Page_Load(object sender, EventArgs e)
    {
    FindBook findBook = new FindBook();
    Response.Redirect(findBook.GetImageUrl(Request.QueryString["isbn"]));
    }
}

public class FindBook
{
  public string GetImageUrl(string isbn)
  {
    try
    {
      isbn = isbn.Replace("-""");
      string bookUrl = "http://www.amazon.com/exec/obidos/ASIN/" + isbn;

      string bookHtml = GetWebPageAsString(bookUrl);

      string imgTagPattern = "<img src=\"(http://images.amazon.com/images/P/" + isbn + "[^\"]+)\"";

      Match imgTagMatch = Regex.Match(bookHtml, imgTagPattern);
      return imgTagMatch.Groups[1].Value;
    }
    catch
    {
      return "";
    }
  }

  public string GetWebPageAsString(string url)
  {
    WebRequest requestHtml = WebRequest.Create(url);

    WebResponse responseHtml = requestHtml.GetResponse();

    StreamReader r = new StreamReader(responseHtml.GetResponseStream());
    string htmlContent = r.ReadToEnd();
    r.Close();

    return htmlContent;
  }
}
9.46.WebClient
9.46.1.Trigger Batch Compile
9.46.2.Read page header
9.46.3.asynchronous page downloading
9.46.4.Retrieve web page
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