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You have done a lot of manual work to get to this point: You have manually created schema files and interface definitions, and you have implemented the operations as Web service methods. To generate a client proxy file, you can rely on the wsdl.exe utility to do the work for you in generating the proxy stub. The proxy file is similar to the IDC file in that it includes class definitions for types and operations. But it is derived from the System.Web.Services. Protocols.SoapHttpClientProtocol namespace, and its purpose is to provide a programmatic interface between the client and the Web service. The proxy class works with the underlying Web services infrastructure to make requests and receive responses using SOAP .

function pageLoad() { alert ('Loading Page...'); //load components } function pageUnload() { alert ('Page unloading...'); } pageLoad is automatically executed as soon as the load event is triggered; the pageUnload method is executed when the unload event is triggered. Once again, you do not

Let s say you and a friend are traveling in Madrid Your friend is fluent in both English and Spanish, but is too lazy to read the guidebook and has no idea what to see in the city You only speak English, but you read the guidebook cover to cover, and you know that the Prado Museum cannot be missed if only you knew how to get there from your hotel So you need to ask directions, but cannot communicate with the locals Your friend can ask for directions, but needs to know from you where you are trying to go The analogy is hopefully clear! You are the business component, your friend is the service agent, and the friendly locals act as the external service..

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have to write any custom event handlers for these two methods. These two methods are automatically wired up to their corresponding events by the Sys.Application class. Keep in mind that there can be many more than the aforementioned three events on a page because components in a page can expose their own sets of events. We ll discuss event handling in a later section in this chapter.

Note You can ignore the material in this section if you use Visual Studio 2005 and work with the Add Web

The business fa ade is not as intuitive as the service agent because it has no analogy in traditional component-based development. Essentially, the business fa ade is a trust boundary that sits between middle-tier business components and the service interfaces that call them. The business fa ade plays the roles of both a service agent and a service interface, and it only applies in situations where there are two or more service interfaces associated with the middle tier. It provides a common interface for multiple service interfaces to interact with. In addition, the business fa ade may provide additional security, authentication, or screening on incoming service requests. Figure 1-5 provides another SOA solution architecture that illustrates the usefulness of the business fa ade.

Other than events, the Sys.Application class also contains a number of methods for managing components in a page. For instance, you can use the getComponents method to get a list of all registered components on a page. You can also use the findComponent method to check the existence of a component in the page. This method takes in two parameters, the name of the component and the ID of the parent component (if any). In the following script, we check for the existence of a control called CustomComponent in a parent control with the ID of Panel1.

Reference Wizard. This wizard will automatically generate the proxy file for you, and you will not need to work directly with the WSDL document. Read this section only if you want to know what happens under the hood when you create a client proxy class file.

In this example, the service layer must handle requests from a wide variety of different services, and it must support three separate service interfaces. A business fa ade is necessary to manage requests from several incoming service

<script language=javascript type="text/javascript"> if ((Sys.Application.findComponent('CustomComponent', Panel1))) alert ('CustomComponent was found on the page!'); </script>

interfaces and to ensure that the requests get communicated to the business components in a consistent fashion.

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