How to grab the first image from page url and display it along BOOKMARK description? [closed]

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I am developing a social bookmarking website in ASP.NET and in it I am displaying bookmarks which users add. I want to put the fist image of web page along with bookmarks to display to user. but I don't know how I get that .

Update (14.09.11): Here's that solution I found:

(HttpWebRequest) HttpWebRequest.Create(TextBox1.Text); 
request.UserAgent = "LPU Crawler"; 
WebResponse response = request.GetResponse(); 
Stream stream = response.GetResponseStream(); 
StreamReader reader = new StreamReader(stream); 
string httptxt = reader.ReadToEnd(); 
extractimgs(httptxt); 
foreach (string pic in pics) 
{ 
    TextBox2.Text += pic; 
    TextBox2.Text += "\n"; 
} 

private void extractimgs(string httptxt) 
{ 开发者_JS百科
    const string match=
        "(?<=img\\s+src\\=[\x27\x22])(?<Url>[^\x27\x22]*)(?=[\x27\x22])"; 
    MatchCollection matches = Regex.Matches(httptxt,match,
        RegexOptions.IgnoreCase); 
    for (int i = 0; i <= matches.Count - 1; i++) 
    { 
        Match anchorMatch = matches[i]; 
        if (String.IsNullOrEmpty(anchorMatch.Value)) 
        { 
            Response.Write("No Img Found"); 
        } 
        pics.Add(anchorMatch.ToString()); 
    } 
}

---

You could use the HTML agility pack.

You can download it via CodePlex:

http://htmlagilitypack.codeplex.com/

Or you can use NuGet:

http://nuget.org/List/Packages/HtmlAgilityPack

Using the Html Agility Pack you can easily download a web page and parse its contents.

To retrieve the URL of the first image you can use the following LINQ query:

var url = "http://www.stackoverflow.com";
var document = new HtmlWeb().Load(url);
var imageUrl = (from image in document.DocumentNode.Descendants("img")
                where !String.IsNullOrEmpty(image.GetAttributeValue("src", null))
                select image.Attributes["src"].Value).FirstOrDefault();
if (imageUrl != null)
{
   //...
}

You can use the address of the image(s) (SRC attribute) to include them in your own page or to issue a web request to download them.

Some quick code to download an image:

string imageUrl= 
    "http://www.example.com/logo.jpg";
WebRequest request = WebRequest.Create(url);
WebResponse response = request.GetResponse();
Image image = Image.FromStream(response.GetResponseStream());
var extension = Path.GetExtension(url).Substring(0, 4);
image.Save(@"c:\test" + extension);