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Directory and File: These classes provide Shared methods that allow you to retrieve information about any files and directories that are visible from your server. DriveInfo, DirectoryInfo, and FileInfo: These classes use similar instance methods and properties to retrieve the same information. These two sets of classes provide similar methods and properties. The key difference is that you need to create a DirectoryInfo or FileInfo object before you can use any methods, whereas the Shared methods of the Directory and File classes are always available. Typically, the Directory and File classes are more convenient for one-off tasks. On the other hand, if you need to retrieve several pieces of information, it s better to create DirectoryInfo and FileInfo objects. That way you don t need to keep specifying the name of the directory or file each time you call a method. It s also faster. That s because the FileInfo and DirectoryInfo classes perform their security checks once when you create the object instance. The Directory and File classes perform a security check every time you invoke a method.

To test this page, select Debug Start Debugging from the menu. Because this is the first time running any page in this application, Visual Studio will inform you that you need a configuration file that specifically enables debugging (see Figure 2-14).

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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.Document = dataDoc ; 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 and File classes provide a number of useful methods. Table 13-1 and Table 13-2 tell the whole story. Note that every method takes the same parameter: a fully qualified path name identifying the directory or file you want the operation to act on. Table 13-1. Directory Methods

Figure 2-14. Adding a web.config file automatically Click OK to add this configuration file. Then, Visual Studio will launch your default browser, with the URL set to your page. At this point, your request will be passed to ASP.NET, which will compile the page and execute it. To test your event-handling logic, click the button on the page. The page will then be submitted to ASP .NET, which will run your event-handling code and return a new HTML page with the data (as shown in Figure 2-15).

HttpContext.Current.Request.PhysicalApplicationPath); } return fileList; } } This example uses the file access classes described in 13 to retrieve a list of files in the web application. This approach wouldn t be possible with the Application collection. The other benefit of using static member variables is that the code that consumes them can be typesafe. Here s an example that uses the FileList property: protected void Page_Load(object sender, EventArgs e) { StringBuilder builder = new StringBuilder(); foreach (string file in Global.FileList) { builder.Append(file + "<br />"); } lblInfo.Text = builder.ToString(); } Notice that no casting step is required to gain access to the custom property you ve added.

CreateDirectory()

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