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that wraps the DataSet. When you create the XmlDataDocument, you supply the DataSet you want as a parameter, as follows: XmlDataDocument dataDocument = new XmlDataDocument(myDataSet) ; Now you can look at the DataSet in two ways. Because the XmlDataDocument inherits from the XmlDocument class, it provides all the same properties and methods for examining nodes and modifying content. You can use this XML-based approach to deal with your data, or you can manipulate the DataSet through the XmlDataDocument.DataSet property. In either case, the two views are kept automatically synchronized when you change the DataSet, the XML is updated immediately, and vice versa. For example, consider the pubs database, which includes a table of authors. Using the XmlDataDocument, you could examine a list of authors as an XML document and then apply an XSL transformation with the help of the Xml web control. Here s the complete code you d need: // Create the ADO.NET objects. SqlConnection con = new SqlConnection(connectionString); string SQL = "SELECT * FROM authors WHERE city='Oakland'"; SqlCommand cmd = new SqlCommand(SQL, con); SqlDataAdapter adapter = new SqlDataAdapter(cmd); DataSet ds = new DataSet("AuthorsDataSet"); // Retrieve the data. con.Open(); adapter.Fill(ds, "AuthorsTable"); con.Close(); // Create the XmlDataDocument that wraps this DataSet. XmlDataDocument dataDoc = new XmlDataDocument(ds) ; // Display the XML data (with the help of an XSLT) in the XML web control. XmlControl.XPathNavigator = dataDoc.CreateNavigator(); XmlControl.TransformSource = "authors.xslt" ; Here s the XSL stylesheet that does the work of converting the XML data into ready-to-display HTML: < xml version="1.0" encoding="UTF-8" > <xsl:stylesheet xmlns:xsl="http://www.w3.org/1999/XSL/Transform" version="1.0"> <xsl:template match="AuthorsDataSet"> <h1>The Author List</h1> <xsl:apply-templates select="AuthorsTable"/> <i>Created through XML and XSLT</i> </xsl:template> <xsl:template match="AuthorsTable"> <p><b>Name: </b><xsl:value-of select="au_lname"/>, <xsl:value-of select="au_fname"/><br/> <b>Phone: </b> <xsl:value-of select="phone"/></p> </xsl:template> </xsl:stylesheet> Figure 12-16 shows the processed data in HTML form.

The directory listing is built using two separate GridView controls, one on top of the other. The topmost GridView shows the directories, and the GridView underneath shows files. The only visible differences to the user are that the directories don t display length information and have a folder icon next to their names. The ShowHeader property of the second GridView is set to False so that the two grids blend into each other fairly seamlessly. And because the GridView controls are stacked together, as the list of directories grows the list of files moves down the page to accommodate it. Technically, you could handle the directory and file listing using one GridView object. That s because all FileInfo and DirectoryInfo objects have a common parent the FileSystemInfo object. However, in this grid you want to show the size in bytes of each file, and you want to differentiate the appearance (in this case, through different icons). Because the DirectoryInfo object doesn t provide a Length property, trying to bind to it in a more generic list of FileSystemInfo objects would cause an error.

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By default, ASP.NET makes a small set of commonly used .NET assemblies available to all web pages. These assemblies (listed in Table 2-4) are configured through a special machine-wide configuration file. You don t need to take any extra steps to use the classes in these assemblies.

To find out all the attributes a file has, you can enumerate over the values in the Attributes property, as shown here: foreach (FileAttributes attribute in myFileAttributes) { .. } You can also call the ToString() method of the Attributes property This returns a string with a comma-separated list of attributes: // This displays a string in the format "ReadOnly, Archive, Encrypted" lblInfoText = myFileAttributesToString(); When testing for a single specific attribute, you need to use bitwise arithmetic For example, consider the following faulty code: if (myFileAttributes == FileAttributesReadOnly) { .. } This test succeeds only if the read-only attribute is the only attribute for the current file This is rarely the case If you want to successfully check whether the file is read-only, you need this code instead: if ((myFileAttributes & FileAttributesReadOnly) == FileAttributesReadOnly) { ...

This problem has another, equally effective solution. You could create a single GridView but not bind directly to the FileInfo.Length property. Instead, you would bind to a method in the page class that examines the current data object and return either the length (for FileInfo objects) or a blank string (for DirectoryInfo objects). You could construct a similar method to hand out the correct icon URL.

Includes the core set of .NET data types, common exception types, and numerous other fundamental building blocks. Includes classes for reading and writing configuration information in the web.config file, including your custom settings. Includes the data container classes for ADO.NET, along with the SQL Server data provider. Includes classes representing colors, fonts, and shapes. Also includes the GDI+ drawing logic you need to build graphics on the fly. Includes the core ASP .NET classes, including classes for building web forms, managing state, handling security, and much more. Includes classes for building web services units of code that can be remotely invoked over HTTP . Includes .NET classes for reading, writing, searching, transforming, and validating XML. Includes .NET classes for COM+ services such as transactions. Includes .NET classes for the mobile web controls, which are targeted for small devices such as web-enabled cell phones.

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