c# url image crawl class

This is c# class for Winforms. Rather than reinvent the wheel I am sure someone already has this class done. Crawl a website url and find all the images on the site and create a thumbnail for each of the images. Then to be able to download the image on demand through code. I really do not need the interface just the class to make this happen. If you want to do a small interface that is ok but I have no need for the user interface just for the code to crawl the website and the code to download the image. I do not need to download all the images just one at a time throught code. Thanks and good luck.....