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Value; To double the value of each node, you simply write a new document that mirrors the structure of the original, applying the necessary changes To change the value of a node, you must first collect all the information about that node (including attributes) and then proceed with writing One of the reasons for such an asymmetry in the reader's and writer's working model is that XML documents are hierarchical by nature and not flat like an INI or a CSV file In the section "A Full-Access CSV Editor," on page 192, I'll discuss a full read/write editor for CSV files for which the preceding pseudocode is much more realistic Testing the XmlTextReadWriter Class Let's review three examples of how the XmlTextReadWriter class can be used to modify XML documents without using the full-blown XML DOM.

general public looking for free Internet access and to mobile hackers. To reduce this risk, refer to the section titled Securing Wireless Networks in this chapter.

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Viruses and worms Networks are subject to virus exposure from e-mail attachments, infected documents, and worms such as CodeRed and Blaster that automatically attack vulnerable servers and clients. Refer to the section titled Securing Client Computers in this chapter for more information.

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Looking at the source code, you'll realize that a read/write streaming parser is mostly achieved by a smart and combined use of readers and writers By making assumptions about the structure of the XML source file, you can simplify that code while building the arsenal of the XmlTextReadWriter class with ad hoc properties such as Value or Name and new methods such as SetAttribute (which would be paired with the reader's GetAttribute method) Changing the Namespace For our first example, consider the problem of changing the namespace of all the nodes in a specified XML file The XmlTextReadWriter parser will provide for this eventuality with a simple loop, as shown here: void ChangeNamespace(string prefix, string ns) { XmlTextReadWriter rw; rw = new XmlTextReadWriter(inputFile); rwWriteStartDocument(); // Modify the root tag manually rwWriterWriteStartElement(rwReaderLocalName); rwWriterWriteAttributeString("xmlns", prefix, null, ns); // Loop through the document 153.

Although security is not something that can be achieved in absolute terms, it should be a clearly de ned goal. The most secure operating system and network in the world is defenseless against someone with physical access to a computer. Evaluate your physical environment to decide what additional security measures you should take, including: Place servers in a locked server room. And control who has keys! Use case locks on your servers and don t leave the keys in them. Place network hubs, routers, and switches in a locked cable room or wiring closet. Install case locks on client systems or publicly accessible systems. Use laptop locks when using laptops in public. Use BitLocker to encrypt the data on laptops that contain sensitive data.

FIGURE 7-25 An Explanation slide showing where you ll switch to another software program. The Detail

Even a highly secure network can be quickly compromised by a poorly secured client computer for example, a laptop running an older version of Windows with sensitive data stored on the hard drive. To maximize the security of client computers, use the following guidelines (refer to 8 and 14, Managing Computers on the Network, for more security procedures):

while(rw.Read()) { switch(rw.NodeType) { case XmlNodeType.Element: rw.Writer.WriteStartElement(prefix, rw.Reader.LocalName, null); rw.Writer.WriteAttributes(rw.Reader, false); if (rw.Reader.IsEmptyElement) rw.Writer.WriteEndElement(); break; } } // Close the root tag rw.Writer.WriteEndElement(); // Close the document and any internal resources rw.WriteEndDocument(); } The code starts by manually writing the root node of the source file. Next it adds an xmlns attribute with the specified prefix and the URN. The main loop scans all the contents of the XML file below the root node. For each element node, it writes a fully qualified new node whose name is the just-read local name with a prefix and namespace URN supplied by the caller, as shown here: rw.Writer.WriteStartElement(prefix, rw.Reader.LocalName, null); Because attributes are unchanged, they are simply copied using the writer's WriteAttributes method, as shown here: rw.Writer.WriteAttributes(rw.Reader, false); The node is closed within the loop only if it has no further contents to process. Figure 413 shows the sample application. In the upper text box, you see the original file. The bottom text box contains the modified document with the specified namespace information.

apply appropriate le permissions so that only valid users can read sensitive data. Encrypt sensitive les on laptop computers using the Encrypting File System (EFS), and encrypt the system drive on laptops using BitLocker (Windows Vista Enterprise and Ultimate only).

The three Detail slides could easily be illustrated with a live demonstration of the technical feeds (upper right), a review of the actual analysis model (lower left), and a tour of the account page features (lower right) sketch a note to that effect on each slide, as shown in Figure 7-25. Next click the rst Detail slide and hold down the Ctrl key as you select the second and third Detail slides, and then right-click and select Hide Slide. Now the audience will not see the three hidden slides, but you know in the planning phase that the headlines are there to guide the points you will make over the next three minutes. During the presentation, when you arrive at the Explanation slide (upper left), verbally explain the point of the headline. When you re ready to switch to the rst live demonstration, hold down the Alt key while you press the Tab key, and then in the window that

Keep clients updated Use the Automatic Updates feature of Windows XP and Windows Vista to keep systems updated automatically, or use Windows Update. Ideally, use the Windows Software Update Service (WSUS) integrated into Windows Small Business Server 2008 to centrally control which updates are installed, as described in 15, Managing Software Updates.

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