This forms a typical n-tier architecture, with the web service
and the information it provides being a resource tier for your web application, which
is the presentation tier. To consume the web service, you would normally require the web
service to be invoked from the server because before the AJAX framework release, it wasn??™t
possible to call it from the client side. This degrades the responsiveness of a web
application because it first must issue a postback to the server and then wait for a
response while the server-side code invokes the web service.
With ASP.NET AJAX, web applications can now invoke web services directly from the
client. The AJAX Library supports client-side web service proxies, which make calling a
web service as easy as calling a JavaScript function. To generate a client-side web service
proxy, you need to specify a
tag within the tag that was discussed
earlier. Within the tag, you need to add a tag for
each web service you want to use.
Web services are ideally suited for business logic that needs to be used by a number
of applications.
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