how to download the image which will be displayed after a caching image on the web page?

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C#

Hi guys,

I want to download an image from a cartoon website. and my app is WinForm, not WebForm.

So let's say that there is an image on the a.html.

Normally, when I click the previous page and am redirected to this page, there will be a image :"image is loading", let's say A.jpg, in the same block.

After 5 seconds, the real one, let's say B.jpg, will be displayed.

So what I got is only the caching image rather than the one, B.jpg, which I want.

So..... how should I do it?

Thanks in advance.

I am using HtmlAgilePack to retrieve the html content.

//this url is about the whole html page
public static string getImageURL(string url)
        {
            string content1 = getPageContent(url);
            HtmlDocument doc = new HtmlDocument();
            doc.LoadHtml(content1);
            HtmlNode img = doc.DocumentNode.DescendantNodes().SingleOrDefault<HtmlNode>(x => x.Id.Equals("showImg"));
            string imgURL = img.GetAttributeValue("src", "");
            return imgURL;

}

by doing it in this way, I got imgURL = "/src/caching.gif"
but the real one is other thing.