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Whenever you open a file through a FileStream, remember to call the FileStream.Close() method when you re finished. This releases the handle on the file and makes it possible for someone else to access the file. In addition, because the FileStream class is disposable, you can use it with the Using statement, which ensures that the FileStream is closed as soon as the block ends.

GetDirectoryName() GetFileName() GetFileNameWithoutExtension() GetFullPath()

The classes for retrieving file information and for reading and writing streams remain essentially the same in .NET 2.0, with a few useful additions. Here are the changes you ll see in this chapter, in their order of appearance: The DriveInfo class: Along with the existing DirectoryInfo and FileInfo classes, the DriveInfo class allows you to get information about a logical drive on the current computer. It s primarily useful for determining free and used space. The FileUpload control: FileUpload works almost the same as the HtmlInput control, allowing a user to upload files from a browser. It has one minor convenience it sets the encoding type of the <form> tag automatically, dodging a common mistake. Compression: The new System.IO.Compression namespace provides classes that let you compress data using the industry-standard GZIP algorithm.

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You can write to a file and read from a file using the StreamWriter and StreamReader classes in the System.IO namespace. When creating these classes, you simply pass the underlying stream as a constructor argument. For example, here s the code you need to create a StreamWriter using an existing FileStream: Dim fStream As New FileStream("c:\myfile.txt", FileMode.Create) Dim w As New StreamWriter(fStream) You can also use one of the Shared methods included in the File and FileInfo classes, such as CreateText() or OpenText(). Here s an example that uses this technique to get a StreamWriter: Dim w As StreamWriter = File.CreateText("c:\myfile.txt") This code is equivalent to the earlier example.

The simplest level of file access just involves retrieving information about existing files and directories and performing typical file system operations such as copying files and creating directories. These tasks don t involve actually opening or writing a file (both of which are tasks you ll learn about later in this chapter). The .NET Framework provides a few basic classes for retrieving file system information. They are all located in the System.IO namespace (and, incidentally, can be used in desktop applications in the same way they are used in web applications). They include the following: Directory and File: These classes provide static 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 static 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.

GetPathRoot()

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