We all are like to develop our own ticker as we like because we need to customize. I have found great article that not only teach us that how to develop a ticker and how we can consume the asp.net C# web service in flash.
Jason Perry has used yahoo stock quote service to get stock prices. He created the web service that consume the yahoo service and a flash application that consume the .net web service.
This application follows n-tier application design by dividing the application into data, business, and presentation logic. This way a designer can focus on building usable interfaces and leave the structure of the back end to the developers.
here is the link for that article: