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The FillControls() helper method simply retrieves the <employee> element whose employeeid attribute is selected in the combo box. It then fills the text boxes with <firstname>, <lastname>, <homephone>, and <notes> element values. The Element() method accepts the name of an XML element and returns the first occurrence of that element as an XElement instance. Finally, the status label of the VCR display is updated to reflect the current employee position.

public void run() {

As mentioned earlier, there are many technologies available for building distributed applications From Microsoft alone, you can use COM+, NET Enterprise Services, MSMQ, NET Remoting, Web Services, and Web Services Enhancements (WSE), to name just a few Each of these requires different domain knowledge and different programming skills WCF incorporates all of these into a single programming model, reducing this overall complexity and making it easier for the developer to focus on the business logic that you are paid to produce Additionally, this allows you to combine each of these technologies into an application in ways that may not be possible today As you work through this chapter, you ll see how, through configuration changes in .

Note In addition to the SetElementValue() and SetAttributeValue() methods, you can also use the Value property of the XElement and XAttribute classes to set the value of an existing element or attribute, respectively. Similarly, in addition to the Add() method, you can use the AddBeforeSelf() and AddAfterSelf() methods to add content before and after the current element, respectively.

This code flags that work is in progress:

config files, you will be able to finely control different services that may have required reams of code before WCF! Figure 7-1 shows the pre-WCF stack of technologies that can be used to build connected applications These technologies are described in the following list: ASMX Web Services: You ve used this throughout this book It is a technology that makes web services easy to implement and deploy It includes the basic Web Services technology and interoperability stack, allowing for stateless connected applications that use SOAP to communicate with clients and servers on Microsoft or other technology stacks WSE: As web services have evolved, so have the standards that implement them New requirements have brought about new standards in security, addressing, and more Microsoft continually updates WSE to bring these standards to ASMX services Messaging: The SystemMessaging namespace in the NET Framework allows programmatic access to Microsoft Message Queuing (MSMQ).

setStopped(false); try {

Whenever any of the elements is added, removed, or renamed, the XElement class raises Changing and Changed events. The Changing event is raised just before the actual change occurs, whereas the Changed event is raised after the change is made. These events give you a chance to perform pre-operations and post-operations related to the change. To illustrate the use of these events, let s modify the preceding application to add support for Changing and Changed events. Modify the Load event of the form to reflect the changes shown in Listing 13-18. Listing 13-18. Wiring Changing and Changed Event Handlers private void Form1_Load(object sender, EventArgs e) { doc=XElement.Load(Application.StartupPath + @"\employees.xml"); doc.Changing += new EventHandler<XObjectChangeEventArgs>(doc_Changing); doc.Changed += new EventHandler<XObjectChangeEventArgs>(doc_Changed); var result=from item in doc.Descendants("employee") select item.Attribute("employeeid").Value; foreach (var obj in result) { comboBox1.Items.Add(obj); } FillControls(); } Notice the code marked in bold. The code wires the event handlers for Changing and Changed events. Both of these events receive an event argument parameter of type XObjectChangeEventArgs. The event handler for the doc_Changed event handler is shown in Listing 13-19.

This allows developers to build messaging-oriented middleware applications where reliable delivery of messages between systems is paramount Remoting: The SystemRemoting namespace in the NET Framework allows object sharing across the network, giving remote users access to application classes, objects, and more This also provides location transparency, easing distributed application development Enterprise Services: The SystemEnterpriseServices namespace in the NET Framework allows programmatic access to a set of classes that allow you to build enterprise-grade applications that use COM+ to support critical systems functionality such as transactions..

until we instruct the thread to stop, or it runs out of links to search, or it reaches the edge of the network of links that we re allowing it to search:

while( !isStopped() && (links.size() > 0) && (depth > 0) ) {