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Type firstname in the search TextBox, and click the Search button The application should list three occurrences of the <firstname> tag in the ListBox Click any of the instances, and you should see its value displayed in the other TextBox..

NOTE With Pluto, we needed to use a workaround for Lucene 1.4-rc3 s lock directory. Lucene uses locks because only one thread can be updating the index at a time. In previous versions of Lucene, the program would check the java.io.tmpdir Java system property and use the temporary directory for the locks. Lucene 1.4 will use the java.io.tmpdir as a default, but uses the value of the org.apache.lucene.lockdir system property if it exists.

Finally, the most common problem when deploying an application like this involves mismatched ASP .NET versions. If your server is configured for ASP.NET 1.1 (as Windows Server 2003 will be by default) but your application was written to use ASP.NET 2.0, your application will fail once deployed. Check IIS Manager on the server and ensure that ASP .NET 2.x is configured. You can see this in Figure 6-20, where ASP.NET Version 2.0 is selected.

In our search portlet and our indexer, we use the Lucene index directory for the lock directory. One advantage of this scenario is that portals on different servers can use the same Lucene index on a networked file system, and the servers will respect the Lucene locks. Each server s temporary directory (the java.io.tmpdir value) would be different, so it is important to map the Lucene lock directory to a shared location. Another possibility would be to create a separate lock directory and use that with all applications that share a Lucene index.

XML data often needs to be searched on the basis of attribute values and not just tag names. The Attributes() and Attribute() methods help you to do just that. To demonstrate the use of these methods, we will develop an application like the one shown in Figure 13-7.

Once you copy your files to the remote web site, you can launch your site to test your pages. You ll notice with a web service that when you view it remotely, you cannot access its test page. Don t worry, this is intentional. ASP.NET blocks the automatic generation of this page for security reasons. For similar reasons, if you re browsing remotely and your web page sustains an exception, you will not see any exception details. To debug this situation, open a browser on the server machine rather than a remote computer and view the site from there you ll get a more meaningful error page.

Here is the relevant section of the portlet.xml deployment descriptor for our portlet s initialization parameter:

<portlet-app ...> <portlet> ... <init-param> <description>File system location of the Lucene index</description> <name>indexPath</name> <value>c:\temp\lucene</value> </init-param> ... </portlet> </portlet-app>

Before you deploy your client tier, you should remember that it is currently configured with a service reference to the service on your development machine. When you deploy it to the server, it will then refer back to the development machine, which isn t what you

The application consists of a combo box that displays a list of employee IDs Recollect that the Employeesxml file stores employee IDs in the employeeid attribute of the <employee> element Upon selecting a specific employee ID and clicking the Show button, the details of that employee (first name, last name, home phone, and notes) are displayed The code that does the searching is shown in Listing 13-10 Listing 13-10 Searching Attribute Values private void Form1_Load(object sender, EventArgs e) { root = XElementLoad(ApplicationStartupPath + @"\employeesxml"); var result = from item in rootElements("employee") where itemAttributes("employeeid")Count() > 0 select itemAttribute("employeeid")Value; foreach (var obj in result) { comboBox1ItemsAdd(obj); } } private void button1_Click(object sender, EventArgs e) { var result = from item in rootElements("employee") where itemAttribute("employeeid") Value == comboBox1SelectedItemToString() select item; foreach (var obj in result) { label6.

You will need to adjust the initialization parameter s value to point to a directory on your file system.