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Now that you have created the Ecommerce web service, you are ready to consume it in a client application. To do so, add a new website to the web service project you just created. Add three web forms to the website: Default.aspx, ShoppingCart.aspx, and Success.aspx. The Default.aspx web form will act as a product catalog and displays a list of products. Users can add items from the product catalog to their shopping cart. The shopping cart is displayed on ShoppingCart.aspx. Users can add, modify, or remove selected items here. When the order is placed successfully, the Success.aspx web form displays a success message to the end user.

To operate a DHCP server on your network, you need to configure two components: the DHCP service itself and the /etc/dhcp3/dhcpd.conf configuration file. You ll learn how to operate these components in the next subsections.

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In complex cases, you may want to search for a node matching a pattern. This is accomplished with the help of XPath. Though XPath is not the subject of this chapter, I will give you a glimpse of how it can be used. I will explain XPath fully in 4. The XmlDocument class has a method called SelectNodes() that accepts the XPath criteria for filtering the available nodes. It returns an XmlNodeList containing the matching nodes. To see how the SelectNodes() method works, we need to develop a Windows application as shown in Figure 2-6. The application consists of a text box for entering the first name or last name of an employee. The radio buttons allow you to choose whether to look for matching first names or last names. Upon clicking the Search button, the SelectNodes() method is called. The returned <employee> nodes are collected in an XmlNodeList. The combo box displays the list of matching employee IDs. You can select an employee ID and click the Show Details button to display the employee details. If you look at the source code of the application, you will find a declaration of a variable of type XmlNodeList at the form level: XmlNodeList list = null; We declare the variable at the form level because it is used in multiple event-handler functions.

The first part of the DHCP server is the DHCP process itself. Its name is dhcpd3 and it resides in the /usr/sbin directory after you ve installed it using the apt-get install dhcp3-common dhcp3-server command as root. Of course, it has some startup scripts in /etc/init.d as well. You can use /etc/init.d/dhcp4-server start to start it; and the options stop, restart, and force-reload work as well.

Note The Chat option can be combined with the other members of the enumeration, such as InOrder or Reliable, and will cause the data inside the network packet to be sent without encryption. This was included to allow XNA network packets to comply with international regulations regarding encrypted chat. Keep in mind that to maintain security, other game data should not use this flag, although it s okay to mix chat data with other data (in other words, to mix encrypted and nonencrypted data) in the same packet.

The main configuration file for the DHCP server is /etc/dhcp3/dhcpd.conf. Everything is configured in this file except startup parameters for the DHCP server. Listing 9-10 is an example configuration file that contains some of the most important options from the example file that s copied to your server after installation of the DHCP server. Listing 9-10. The DHCP Server s Main Configuration File is /etc/dhcp3/dhcpd.conf root@RNA:~# cat /etc/dhcp3/dhcpd.conf # # Sample configuration file for ISC dhcpd for Debian # # $Id: dhcpd.conf,v 1.4.2.2 2002/07/10 03:50:33 peloy Exp $ # # option definitions common to all supported networks... option domain-name "fugue.com"; option domain-name-servers toccata.fugue.com; option subnet-mask 255.255.255.224; default-lease-time 600; max-lease-time 7200; #subnet 204.254.239.0 netmask 255.255.255.224 { # range 204.254.239.10 204.254.239.20; # option broadcast-address 204.254.239.31; # option routers prelude.fugue.com; #} # The other subnet that shares this physical network #subnet 204.254.239.32 netmask 255.255.255.224 { # range dynamic-bootp 204.254.239.10 204.254.239.20; # option broadcast-address 204.254.239.31;

Figure 2-6. Using the SelectNodes() method The Click event handler of the Search button is shown in Listing 2-9. Listing 2-9. Using the SelectNodes() Method private void button1_Click(object sender, EventArgs e) { XmlDocument doc = new XmlDocument(); doc.Load(Application.StartupPath + "/employees.xml"); if (radioButton1.Checked) { list = doc.SelectNodes(string.Format ("//employee[./firstname/text()='{0}']",textBox1.Text)); } else { list = doc.SelectNodes(string.Format ("//employee[./lastname/text()='{0}']",textBox1.Text)); } foreach (XmlNode node in list) { comboBox1.Items.Add(node.Attributes["employeeid"].Value); } }

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