How can I use HTML Agility Pack to retrieve all the images from a website?

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You can do this using LINQ, like this:

var document = new HtmlWeb().Load(url);
var urls = document.DocumentNode.Descendants("img")
                                .Select(e => e.GetAttributeValue("src", null))
                                .Where(s => !String.IsNullOrEmpty(s));

EDIT: This code now actually works; I had forgotten to write document.DocumentNode.

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