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class by passing the database connection string and table name to its constructor. Then an XmlTextWriter is created that writes data to a temporary XML file called temp.xml. The TableReader class will return only the fragmented XML data; hence the root element is added by using the WriteStartElement() method of the XmlTextWriter class. The total number of columns in the supplied table is retrieved by using the AttributeCount property and is stored in a variable for later use. A while loop calls the Read() method of the TableReader class. With each iteration, an element is added to the file with the same name as the table name. Recollect that the Name property of the TableReader class returns either the table name or column name depending on the current column index. Because we have just called the Read() method, the column index is going to be -1 and hence the table name will be returned. Next, a for loop iterates through all the attributes that is, columns. With each iteration of the for loop, the value of the attribute is read by using the ReadAttributeValue() method. An attribute is then written to the file along with its value by using the WriteAttributeString() method of the XmlTextWriter class. The WriteEndElement() method of the XmlTextWriter class writes end tags for the nearest open element. The TableReader and XmlTextReader are then closed by using their respective Close() methods. Finally, the Navigate() method of the web browser control shows the user the XML file.

The next method allows the owner of the crawler to retrieve the set of links (as URL objects) that the crawler has encountered so far and that were valid. Access to the set of visited URLs is synchronized, and a copy is returned, so that it is not possible for two threads to try to access the set simultaneously. By pursuing this policy for all of the publicly accessible stores of data provided by the crawler, we make it thread safe with very little use of synchronization. Judicious use of the synchronized keyword is important because it carries a significant performance penalty. While this isn t a big deal for our crawler (which is not limited by processing speed so much as by bandwidth), getting good responsiveness is often the primary goal when using threads:

indows Presentation Foundation (WPF) is the unified presentation subsystem for Windows. It is made up of a display engine and a suite of managed classes that you can use to build applications that use it. It introduces XAML an XML format that is used to define the UI, animations, interactions, and bindings, which are the glue of an application. Its ultimate aim is to provide a user experience beyond the traditional gray formlike interfaces of client applications. It introduces a new graphics driver model that is designed to use the power of the graphics processing unit (GPU) that is available to most modern desktop computers. In this chapter, you ll take a look at the managed classes that provide the underpinnings of a WPF application, the XAML language that defines a WPF application, and the tools that can be used to build WPF applications, including Expression Blend, Expression Design, and Visual Studio 2008 (or alternatively, Visual Studio 2005 with the .NET 3.x extensions). You ll wrap up the chapter by building a WPF-based UI on top of the AdventureWorks address data service that you ve been using in earlier chapters.

public Set getVisitedURLs() { synchronized(this.visited) { return new HashSet(this.visited); } }

In the preceding example, we simply populated a DataSet with the help of the SqlXmlAdapter class. What if you make changes to the DataSet data and wish to save those changes in the database The SqlXmlAdapter does provide the Update() method that updates the database with any changes to your DataSet. However, you need to do a bit more work than that. While filling the DataSet, you need to specify the XSD schema for the DataTable being created. This schema provides mapping between the DataTable column names and the actual table column names. In our example, we retrieve three columns of the Employee table: EmployeeID, FirstName, and LastName. The schema for this data structure is shown in Listing 10-21. Listing 10-21. Schema Employees.xsd for Our Data < xml version="1.0" encoding="utf-8" > <xs:schema xmlns:xs="http://www.w3.org/2001/XMLSchema"> <xs:element name="Employees"> <xs:complexType> <xs:sequence> <xs:element name="EmployeeID" type="xs:integer"/> <xs:element name="FirstName" type="xs:string"/> <xs:element name="LastName" type="xs:string"/> </xs:sequence> </xs:complexType> </xs:element> </xs:schema> The schema defines a root element called <Employees>, which has three child elements: <EmployeeID>, <FirstName>, and <LastName>. Note that the schema defines the columns as elements and not as attributes. To see the SqlXmlAdapter class in action, you need to develop an application as shown in Figure 10-5.