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The destroy() method will not be invoked until all other initialization or processing threads on the instance have completed. It will be invoked when the container determines that the portlet is no longer required the container is not required to keep the portlet in service for any specific period of time. The container invokes the destroy() method to release any resources that have been retained by the portlet. The portlet will then be de-referenced by the container and the garbage collector will be free to remove the portlet object from memory. The destroy() method is guaranteed to be called (unless initialization failed with an exception), so this is also an appropriate place in which to notify other parts of the application that the portlet is becoming unavailable. Finalizers should not be used since their invocation is not guaranteed. Destroying our example portlet looks like this:

function createSilverlight() { Silverlight.createObjectEx({ source: "#xamlContent", parentElement: document.getElementById("SilverlightControlHost"), id: "SilverlightControl", properties: { width: "100%", height: "100%", version: "1.0" }, events: { onLoad: handleLoad } }); }

foreach (var obj in result) { comboBox1.Items.Add(obj); } FillControls(); } The code declares a variable of type XElement at form level. In the Load event, it loads Employees.xml into it. The descendent elements of the root node (i.e., all the <employee> elements) are retrieved using the Descendents() method, and their attributes are added to the combo box. The FillControls() method (discussed later) simply fetches the <employee> element matching the currently selected employee ID and displays its details (first name, last name, home phone, and notes) in the appropriate text boxes.

public void destroy() { portletCounter--; }

This is the name of the <div> element that contains the Silverlight component within the HTML. In order for your Silverlight application to work correctly, this property must be set, and it must be set to the correct value.

It will be common for your SELECT queries to have some parameters, and the technique to execute parameterized queries is similar to ADO.NET. However, there are a few differences. First, a parameter is represented by the SqlXmlParameter class. Second, the SqlXmlCommand class doesn t have

Our example portlet uses the destroy() method to reduce the count of its running instances in the class attribute portletCounter.

5

This is the required ID for the Silverlight control. If you want to reference the control from JavaScript in order to manipulate it or its DOM, it needs to be identifiable, and as such, the control needs an ID.

a Parameters collection as does the SqlCommand class, so you need to call the CreateParameter() method of the SqlXmlCommand class to create a new parameter that belongs to the command. The value of the parameter can then be set. To illustrate the use of the SqlXmlParameter class, we will create an application like the one shown in Figure 10-3.

Using Servlets and JavaServer Pages with Portlets . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 119

This sets the width of the control in percent or pixels. This will be limited by the size of the <div> containing the control.

Portlets, Servlets, and JSP Design Goals 119 Portlet Request Dispatcher 120 Request and Response Objects 126 Session Management Between a Portlet and a Servlet or JSP 131 Creating a Form in JSP 132 Using the Portlet JSP Tag Library 132 To-Do List Portlet Example 137.

Figure 10-3. Application for executing parameterized queries The application allows you to fetch details of only one employee whose EmployeeID is specified in the text box. The returned XML data is displayed in the Web Browser control as before. Listing 10-19 shows the Click event handler of the Execute button. Listing 10-19. Using the SqlXmlParameter Class private void button1_Click(object sender, EventArgs e) { string strConn = @"Provider=SQLOLEDB;server=.\sqlexpress;database=northwind;integrated security=SSPI"; string sql = "SELECT employeeid,firstname,lastname FROM employees WHERE employeeid= FOR XML AUTO,ROOT('MyRoot')"; SqlXmlCommand cmd = new SqlXmlCommand(strConn); cmd.CommandText = sql; SqlXmlParameter param = cmd.CreateParameter(); param.Value = textBox1.Text; StreamWriter writer = File.CreateText(Application.StartupPath + @"\sqlxmlresults.xml"); cmd.ExecuteToStream(writer.BaseStream); writer.Close(); webBrowser1.Navigate(Application.StartupPath + @"\sqlxmlresults.xml"); }

This sets the height of the control in percent or pixels. This will be limited by the size of the <div> containing the control.