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In this chapter, you got a taste of ASP.NET s XML features. The class libraries for interacting with XML are available to any .NET application, whether it s a Windows application, a web application, or a simple command-line tool. They provide one of the most fully featured toolkits for working with XML and other standards such as XPath, XML Schema, and XSLT. XML is a vast topic, and there is much more to cover, such as advanced navigation, search and selection techniques, validation, and serialization. If you want to learn more about XML in .NET, you may want to refer to Pro .NET XML (Apress, 2005). But remember that you should use XML only where it s warranted. XML is a great tool for persisting file-based data in a readable format and for sharing information with other application components and services. However, it doesn t replace the core data management techniques you ve seen in previous chapters.

When you write the XML data, you can choose between several slightly different formats by specifying an XmlWriteMode You can indicate that you want to save both the data and the schema in a single file (XmlWriteModeWriteSchema), only the data (XmlWriteModeIgnoreSchema), or the data with both the current and the original values (XmlWriteModeDiffGram) Here s the code that you need to save a DataSet to an XML file: string xmlFile = ServerMapPath("Employeesxml"); dsWriteXml(xmlFile, XmlWriteModeWriteSchema); This code creates an Employeesxml file in the current folder Now you can perform the reverse step by creating a new DataSet object and filling it with the data contained in the XML file using the DataSetReadXml() method as follows: DataSet dsXml = new DataSet("Northwind"); dsXmlReadXml(xmlFile); This completely rehydrates the DataSet, returning it to its original state.

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The comment entries are more interesting, because they re added automatically and they link to a specific line in your code. To try the comment feature, move somewhere in your code, and enter the comment marker (//) followed by the word TODO (which is commonly referred to as a token tag). Now type in some descriptive text: // TODO: Replace this hard-coded value with a configuration file setting. string fileName = @"c:\myfile.txt" Because your comment uses the recognized token tag TODO, Visual Studio recognizes it and automatically adds it to the Task List (as shown in Figure 2-11).

ost web applications rely heavily on databases to store information. Databases are unmatched in multiuser scenarios. They handle simultaneous access without a hitch, and they support caching and low-level disk optimizations that guarantee blistering performance. Quite simply, an RDBMS offers the most robust and best-performing storage for data. Of course, most web developers inevitably face a scenario where they need to access data in other locations, such as the file system. Common examples include reading information produced by another application, writing a quick-and-dirty log for testing purposes, and creating a management page that allows administrators to upload files and view what s currently on the server. In this chapter, you ll learn how to use the classes in the System.IO namespace to get file system information, work with file paths as strings, write and read files, and serialize objects.

If you want to see the structure of the generated Employeesxml file, you can open it in Internet Explorer, as shown in Figure 12-15 Notice how the first part contains the schema that describes the structure of the table (name, type, and size of the fields), followed by the data itself..

To move to the line of code, double-click the new task entry. Notice that if you remove the comment, the task entry is automatically removed as well. Three token tags are built-in HACK, TODO, and UNDONE. However, you can add more. Simply select Tools Options. In the Options dialog box, navigate to the Environment Task List tab. You ll see a list of comment tokens, which you can modify, remove, and add to. Figure 2-12 shows this window with a new ASP comment token that you could use to keep track of sections of code that have been migrated from classic ASP pages.

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