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This code first creates an instance of the address service client (called myAddressService) and then uses it to get addresses for the ZIP code 6105. The rest of the code then reads the results into an XML document, creates a DataSet from it, and binds the grid to this DataSet. As you can see, from a coding point of view, you don t do anything special to communicate with the service everything is handled by the autogenerated proxies, which were built based on the defined contracts. Now that you have a simple service that runs with WCF, you can start playing with how to make it transactable, or add certificate-based security, or use WS-Reliability, among other things. A great resource for getting started on this is the Windows SDK. It contains a file (WCFSamples.zip) that contains step-by-step instructions and code on how to achieve the most common tasks. Check out the extensibility samples in particular.

This method allows the owner to stop the crawler:

To consume the TableReader class, you need to create a Windows application like the one shown in Figure A-2. The application consists of text boxes for entering the database connection string and table name, respectively. After you click the Read button, the TableReader class is instantiated. It reads the table data and writes it to an XML file. The XML file thus created is displayed in a Web Browser control. The Click event handler of the Read button contains the code shown in Listing A-4.

public void stopCrawler() { setStopped(true); }

Summary

The following private method sets the flag that causes the crawler to stop, and if it s set to true, it instructs any child crawler threads to stop as well:

Figure A-2. Application that consumes TableReader class Listing A-4. Using the TableReader Class private void button1_Click(object sender, EventArgs e) { TableReader tr = new TableReader(textBox1.Text, textBox2.Text); XmlTextWriter writer = new XmlTextWriter(Application.StartupPath + @"\temp.xml", null); writer.WriteStartDocument(); writer.WriteStartElement("root"); int count = tr.AttributeCount; while (tr.Read()) { writer.WriteStartElement(tr.Name); for (int i = 0; i < count; i++) { tr.MoveToAttribute(i); tr.ReadAttributeValue(); writer.WriteAttributeString(tr.Name, tr.Value); } writer.WriteEndElement(); } writer.WriteEndElement(); tr.Close(); writer.Close(); webBrowser1.Navigate(Application.StartupPath + @"\temp.xml"); } Before you write the preceding code, add a reference to TableReader.dll in the Windows application and import the namespace at the top. The code creates an instance of the TableReader

This chapter has given you an introduction to WCF and how it can be used to navigate the murky seas of different connectivity technologies and standards without needing to write thousands of lines of code. WCF is a critical component of .NET 3.0, and is something that you will find invaluable as you build the next Web. Your need to build applications that use standards around security, reliability, transactions, and more is only going to grow over time, and this framework is your best friend in empowering this. You ve barely scratched the surface of what is possible in this chapter, but hopefully you ve gleaned enough to understand how it all works and hangs together. For further resources, take a look through the SDK and more in-depth books like Pro WCF: Practical Microsoft SOA Implementation (Apress, 2007). In the next chapter, you ll look at another of the new pillars of .NET 3.0 Windows Presentation Foundation, a technology that can be used to bring your user experience to the next level. It s also the big brother of a technology that you ll be seeing a lot of in the future of the Web: Silverlight.

private void setStopped(boolean stopped) { if(stopped) notifyStopCrawlers(); this.stopped = stopped; }