get realtime data from website

[C# Programming]

hi,
i am trying to get realtime data from following website:
http://www.igindex.co.uk/pricestream/outside/getMarketList?webSiteId=igi&businessArea=F&locale=en_GB&firstTime=true[^ (http://www.igindex.co.uk/pricestream/outside/getMarketList?webSiteId=igi&businessArea=F&locale=en_GB&firstTime=true)]

currently i am using the WebBrowser class in c# to access the site. I am using a timer and scan the website to get the most recent information. is it possible to get this data without a timer but with a callback e.g. whnever a value update/change occurs?

thanks http://www.barakasoft.com/script/Forums/Images/smiley_smile.gif