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Put a breakpoint in this code (by selecting the line and pressing F9) and run the application. Select an item on the list. Nothing happens the event doesn t fire because there is no postback typically associated with a list box. Only form submit buttons cause postbacks, at least when you re not using ASP.NET. Now, there are a couple of things you can do here. First of all, you can put a button on the form, and when you press the button, a postback will be triggered. The postback contains information for all raised events, not just the action that caused the postback (the

To begin developing the application, add a reference to the System.Runtime.Remoting and EmployeeServer assemblies. Also, import the System.Runtime.Remoting and EmployeeServer namespaces at the top of the form class. Now add a new XML file named EmployeeClient.config to the project. This configuration file will store the settings required to configure the remoting infrastructure at the client end. The complete markup of EmployeeClient.config is shown in Listing 11-5. Listing 11-5. Configuring the Remoting Client < xml version="1.0" encoding="utf-8" > <configuration> <system.runtime.remoting> <application> <client> <wellknown type="EmployeeServer.Employee,EmployeeServer" url="tcp://localhost:8088/MyRemoteObject"></wellknown> </client> </application> </system.runtime.remoting> </configuration> Just like the server configuration file, the root node of the client configuration file is <configuration>, but the <application> section this time contains the <client> subsection. The <client> subsection contains a tag named <wellknown> that specifies details about the remote type. Its attributes are as follows: The tag attribute specifies the fully qualified type name and the assembly. The url attribute specifies the complete URL of the remote server. Because we are using the TCP channel, the URL protocol is tcp. The port at which the server is listening is mentioned just after localhost. Finally, the URI of the remote object (MyRemoteObject in our case) is specified. Now we are ready to consume the remote object. Listing 11-6 shows the relevant code. Listing 11-6. Calling a Method of a Remote Object private void Form1_Load(object sender, EventArgs e) { RemotingConfiguration.Configure(Environment.CurrentDirectory + @"\EmployeeClient.config", false); }

In this chapter, we looked at converting an existing application into a portlet. We discussed how to adapt the JSP files to behave as a single portlet, we discussed the configuration of the database connection, and we looked at the creation of tag libraries to interact with the portlet-specific behavior. In the next chapter, we look at presenting summary information such as charts and reports within a portlet.

submit button). To see the postback and how it contains information for all events, add an ASP .NET button to the form, run it, select a list item, and then click the button. You ll see that your breakpoint on the ListBox s SelectedIndexChanged handler still trips, even though your action was to click the form s submit button. (Note that if you provided a handler for the submit button, that handler code would also be executed.) This demonstrates that ASP.NET passed the event information for everything on the page when you triggered the postback. The information for the list selection changed got passed along, too, and when the server received the postback, it triggered the event. Alternatively, you can use the automatic postback feature that the ASP.NET ListBox provides you with by setting the ListBox.AutoPostBack property to true. You can do this with the Property Editor or simply by adding the AutoPostBack='True' attribute to the <asp:ListBox> declaration. Remove the button from the page and try running the application again with the AutoPostBack='True' attribute present in the list box s markup. Now whenever you select an item on the list box, the page triggers a postback, and the SelectedIndexChanged event fires. Right now, this just loads the text of the selection into a dummy string. In your application, you could use this to give feedback to the user, or you could determine its index to for example enter selection data into a database. Thus, when using ASP .NET, you have a number of options for how and when events are handled by the framework, and you can design your UI accordingly.