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With C# .NET i would like to DL 2 webpages and find the DIFF between the webpage. Then i would like to program my app to allow me to label specific dif areas then parse for a series of urls.

What diff lib may help me find each area?

+1  A: 

I'd imagine that you'd need something that 'understood' HTML to be able to sensibly diff the two files. I haven't seen any such library, there are a few tools out there like DiffDog and HTML Match but no libraries.

I'm afraid you'd be starting from scratch on that one.

Lazarus
+1  A: 

If you know the web pages are xhtml strict you could possibly use the MS XML diff tool

It should give you a starting point to work from at least!

Mongus Pong