NET AJAX application. You??™ll see how technical traders use this to determine
potential times to get in and out of a stock. This should not be construed as investment
advice; it is provided for informational use only and as a demonstration of the ASP.NET
technology. You can see a snapshot of this application in Figure 10-1.
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226 CHAPTER 10 ?– BUILDING A SAMPLE APPLICATION USING ASP.NET AJAX
Figure 10-1. An ASP.NET AJAX-based stock application
Understanding the Application Architecture
The application is built as a typical logical n-tier application comprising a resource tier
that contains the back-end resources. In this case, the resources are the Company Information
web service (courtesy of Flash-db.com, a provider of a number of useful and free
web services) and the Price History web service that provides comma-separated values
(CSV) over HTTP from Yahoo!. You can see the architecture in Figure 10-2.
Figure 10-2. Application logical architecture
In a multitiered architecture like this, the information that drives your service comes
from the resource tier.
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