sreenscrape a website

The project involves screen scraping / data mining a website. I would like to outsource the adding of new operator's website to a fully functioning flight comparison engine built in C#. The comparison engine allows users to easily compare the prices to a destination from a number of competing operator sites e.g. Lastminute, Ebookers, Expedia etc. In order to expand the search, new websites have to be integrated into the search engine. In order for this to be done you must simulate the http request then parse the relevant data so that the price and time information can be stored in a database. All the necessary functions and classes are already in place and you would be expected to build upon the code that will be provided to you.