ASP.net Web Spider

I am looking a ASP.NET application (VB.net preferred, C# ok too) that can extract information 'objects' from a page. Basically, I want a spider that can crawl several of my competitors web sites and retrieve current prices on different products on a regular basis. The only data that I am looking for from each product page is the product name, the price, the URL, and the meta name="keywords" section if available. This data will be written to a CSV file. It must be easy to configure the search strings so that I can add a new site (i.e. look for "Our Price: " or "Your Price: "). It should very stable and should run as fast multithreaded, automated spidering engine. ## Deliverables 1) Complete and fully-functional working program(s) in executable form as well as complete source code of all work done. 2) Complete ownership and distribution copyrights to all work purchased. ## Platform Windows 2000. ASP.net (VB preferred)