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Allows you to retrieve or set attributes using a combination of values from the FileAttributes enumeration. Allows you to set or retrieve the creation time, last access time, and last write time using a DateTime object. Returns true or false depending on whether the file or directory exists. In other words, you can create FileInfo and DirectoryInfo objects that don t actually correspond to current physical directories, although you obviously won t be able to use properties such as CreationTime and methods such as MoveTo(). Returns a string that represents the fully qualified name, the directory or filename (with extension), or the extension on its own, depending on which property you use. Removes the file or directory, if it exists. When deleting a directory, it must be empty, or you must specify an optional parameter set to true. Updates the object so it s synchronized with any file system changes that have happened in the meantime (for example, if an attribute was changed manually using Windows Explorer). Creates the specified directory or file. Copies the directory and its contents or the file. For a DirectoryInfo object, you need to specify the new path; for a FileInfo object, you specify a path and filename.

As you program with Visual Studio, you ll become familiar with its many timesaving conveniences. The following sections outline the most important features you ll use (none of which is new in Visual Studio 2005).

Unfortunately, you need to use a template to gain the ability to write XPath data binding expressions. That limits the usefulness of other controls (such as drop-down lists) in XML data binding scenarios. Although you can bind them to attributes without any problem, you can t bind them to show element content.

FullName, Name, and Extension Delete() Refresh()

Visual Studio does include one new IntelliSense feature XHTML (Extensible HTML) validation. You ll learn about this feature, and how to control the level of XHTML support you want, in 3.

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You can also use XPath to filter out the initial set of matches. For example, imagine you want to create a grid that shows a list of stars rather than a list of movies. To accomplish this, you need to use the XPath support that s built into the XmlDataSource to prefilter the results.

Outlining allows Visual Studio to collapse a subroutine, block structure, or region to a single line. It allows you to see the code that interests you, while hiding unimportant code. To collapse a portion of code, click the minus box next to the first line. Click the box again (which will now have a plus symbol) to expand it (see Figure 2-16).

Create() MoveTo()

To use XPath, you need to supply the XPath expression that selects the data you re interested in by using the XmlDataSource.XPath property. This XPath expression extracts an XmlNodeList, which is then made available to the bound controls. <asp:XmlDataSource ID="sourceDVD" runat="server" DataFile="DvdList.xml" XPath="/DvdList/DVD/Starring/Star" /> If that expression returns a list of nodes, and all the information you need to display is found in attributes, you don t need to perform any extra steps. However, if the information is in element text, you need to create a template. In this example, the template simply displays the text for each <Star> node: <asp:GridView ID="GridView1" runat="server" DataSourceID="sourceDVD" AutoGenerateColumns="False"> <Columns> <asp:TemplateField HeaderText="DVD"> <ItemTemplate> <%# XPath(".") %><br /> </ItemTemplate> </asp:TemplateField> </Columns> Figure 12-11 shows the result.

Visual Studio makes it easy for you to interact with controls and classes. When you type a class or object name, Visual Studio pops up a list of available properties and methods (see Figure 2-17). It uses a similar trick to provide a list of data types when you define a variable and to provide a list of valid values when you assign a value to an enumeration.

In addition, the FileInfo and DirectoryInfo classes have a couple of unique members, as indicated in Tables 13-4 and 13-5. Table 13-4. Unique DirectoryInfo Members

Figure 12-11. Using XPath to filter out results You can create a simple record browser using the XmlDataSource.XPath property. Just let the user choose an ID from another control (such as a drop-down list), and then set the XPath property accordingly: sourceDVD.XPath = "/DVDList/DVD[@ID=" + dropDownList1.SelectedValue + "]"; This works because data binding isn t performed until the end of the page life cycle.

Visual Studio also provides a list of parameters and their data types when you call a method or invoke a constructor. This information is presented in a tooltip above the code and is shown as you type. Because the .NET class library heavily uses function overloading, these methods may have multiple different versions. When they do, Visual Studio indicates the number of versions and allows you to see the method definitions for each one by clicking the small up and down arrows in the tooltip. Each time you click the arrow, the tooltip displays a different version of the overloaded method (see Figure 2-18).

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