Generating Thumbnails on the Fly Using ASP.NET!
If you've ever attempted to create image thumbnails for your site, you'll know it's a tiresome task. You either do it manually, or use an inflexible system such as the FrontPage thumbnail feature.

However, as you've seen in previous tips, ASP.NET gives us tremendous control over how our images work. As such, we should be able to generate thumbnails on the fly... and this snippet will enable you to do just that.

http://www.developer.com/net/asp/article.php/3098311