How do I download all images from a web page in C# using WPF?

I am trying to write a program using C# and WPF to download all images from a web page.

In my XAML I added the following control:

<WebBrowser x:Name="scrapeWebBrowser" Grid.Column="1" Grid.Row="1"/>

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For testing, I created a test button that does the following:

scrapeWebBrowser.Navigate("http://yahoo.com");
HTMLDocument objHtmlDocument = (HTMLDocument)scrapeWebBrowser.Document;

foreach (IHTMLElementCollection imageElements in objHtmlDocument.images)
{
//I am not sure what to do here.  I am trying to get the reference to the image.
}

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How do I get a reference in my code above?  Once I have the reference, how do I download it?

Any direction would be greatly appreciated.      

Many Thanks!