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The code declares a variable of type XmlNodeList at the form level. This variable needs to be declared at the form level because we need to access it in two event handlers. In the Click event handler of the Search button, an XmlDocument instance is created. The Employees.xml file is loaded into it by using its Load() method. The code then calls the GetElementByTagName() method of the XmlDocument object, which accepts the tag name to look for. In our application, the tag is specified in textBox1. As mentioned earlier, the return value of the GetElementByTagName() method is of type XmlNodeList. The XmlNodeList class stores the collection of XmlNode objects. The code then iterates through the returned XmlNodeList and adds each node name into the list box. The user can select any of the nodes displayed in the list box. In order to show the contents of the selected node, the code handles the SelectedIndexChanged event of the list box. Inside the SelectedIndexChanged event handler, the selected node is retrieved from the XmlNodeList we stored previously. The contents of the selected node are displayed using the InnerXml property of the XmlNode class, which returns all the XML content that is inside the node under consideration. To see how the application works, run it from the Visual Studio IDE. Enter firstname in the search text box, and click the Search button. The list box should display three firstname entries. This is expected because our XML document contains three <employee> nodes, each having a <firstname> child element of its own. Click any of the firstname entries from the list box. The text box beside the list box should show the value of the firstname node.

private static int portletCounter = 0; private int renderCounter = 0; private int actionCounter = 0; }

As you can see from the preceding example, the user types a URL into the browser, and IIS serves the HTML page in response to their request. The HTML code is then rendered by the browser as shown in Figure 6-6. When IIS received this request, the first thing it did was to examine this URL and establish the location of the content. First, it recognized that no port was specified on the URL, so it used port 80, which is the standard (default) HTTP port. If this server had been running on port 81, for example, then the URL of the server should be postfixed with :81, like this: http://servername:81/. It then decodes the virtual directory and/or subdirectories that determine where the content is located. In the preceding example, the URL dictated that the content should be found in 6Test, which is a virtual directory that maps to C:\InetPub\wwwroot\ 6TestSite for this example. Finally, at the end of the URL is the content itself, which in this case is test.htm. If this content is present in the specified location, it will be rendered and the resulting content returned to the requesting user. Note that if you want to deliver nonstandard web content, you will have to specify its Multipurpose Internet Mail Extensions (MIME) type by using IIS Manager. Later in this book, you ll use Extensible Application Markup Language (XAML), which is a variant of XML that is used to deliver graphical information. This is an example of a MIME type that you ll to need add for the server to recognize it as a valid content request. If you don t, IIS and its default security lockdowns will prevent you from serving resources with nonstandard content.

The portlet.xml file for the simple portlet follows:

Often, our XML elements have an attribute that is unique for each instance of that element in the XML document. We may want to look for a specific element based on this attribute value. This process is analogous to looking for a record in a database based on its primary key. The difference, however, is that the XmlDocument class does not know automatically that a specific attribute is acting as a primary key for that element. Formally, such an attribute is called the ID of that element. To convey this information, you must use a DTD or schema. Both of these techniques can mark an attribute as the ID of the element, and the XmlDocument class can then understand them as IDs. After you have a DTD or schema attached to your XML document, you can call the GetElementById() method of the XmlDocument class. The GetElementById() method accepts the ID of the element to search for and returns that element as an instance of the XmlElement class. You can then access the subelements or text inside this element. To illustrate the use of the GetElementById() method, we will build an application like the one shown in Figure 2-5. The application consists of a combo box showing a list of employee IDs. After you select an ID and click the Show Details button, the details such as firstname, lastname, homephone, and notes are displayed below.

< xml version="1.0" encoding="UTF-8" > <portlet-app xmlns="http://java.sun.com/xml/ns/portlet/portlet-app_1_0.xsd" version="1.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://java.sun.com/xml/ns/portlet/portlet-app_1_0.xsd http://java.sun.com/xml/ns/portlet/portlet-app_1_0.xsd"> <portlet> <description>PortletBook Simple Portlet</description> <portlet-name>simple</portlet-name> <display-name>Simple Portlet</display-name> <portlet-class>com.portalbook.crawler.SimplePortlet</portlet-class> <expiration-cache>-1</expiration-cache> <supports> <mime-type>text/html</mime-type> <portlet-mode>VIEW</portlet-mode> </supports> <supported-locale>en</supported-locale> <portlet-info> <title>Simple Portlet</title> <short-title>Simple</short-title> <keywords>Simple, Example</keywords> </portlet-info> </portlet> </portlet-app>

To manage the served MIME types, select Properties for the site, and then select the HTTP Headers tab (see Figure 6-7).