hi,

Project + Reference, select Microsoft.mshtml.  This sample code retrieves all the image urls from google.com.  Beware of duplicates, you'll need a dictionary.

  public partial class Form1 : Form {
    public Form1() {
      InitializeComponent();
      webBrowser1.DocumentCompleted += new WebBrowserDocumentCompletedEventHandler(webBrowser1_DocumentCompleted);
      webBrowser1.Url = new Uri("http://google.com");
    }

    void webBrowser1_DocumentCompleted(object sender, WebBrowserDocumentCompletedEventArgs e) {
      HtmlDocument doc = webBrowser1.Document;
      foreach (HtmlElement tag in doc.Body.All) {
        if (tag.TagName == "IMG") {
          mshtml.IHTMLImgElement img = tag.DomElement as mshtml.IHTMLImgElement;
          string imgUrl = img.href;
          // download image with WebClient.DownloadXxx() here
          //..
          Console.WriteLine(imgUrl);
        }
      }
    }
  }

---

Hans Passant.

doubtful, the HTTP standard does not enumerate a web site. You can know a file exists if the image is referenced by a webpage, but you can not know if there are some imaghe not referenced. 

Project + Reference, select Microsoft.mshtml.  This sample code retrieves all the image urls from google.com.  Beware of duplicates, you'll need a dictionary.

  public partial class Form1 : Form {
    public Form1() {
      InitializeComponent();
      webBrowser1.DocumentCompleted += new WebBrowserDocumentCompletedEventHandler(webBrowser1_DocumentCompleted);
      webBrowser1.Url = new Uri("http://google.com");
    }

    void webBrowser1_DocumentCompleted(object sender, WebBrowserDocumentCompletedEventArgs e) {
      HtmlDocument doc = webBrowser1.Document;
      foreach (HtmlElement tag in doc.Body.All) {
        if (tag.TagName == "IMG") {
          mshtml.IHTMLImgElement img = tag.DomElement as mshtml.IHTMLImgElement;
          string imgUrl = img.href;
          // download image with WebClient.DownloadXxx() here
          //..
          Console.WriteLine(imgUrl);
        }
      }
    }
  }

---

Hans Passant.