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Note Although GZIP is an industry-standard compression algorithm (see http://www.gzip.org for information), that doesn t mean you can use third-party tools to decompress the compressed files you create. The problem is that although the compression algorithm may be the same, the file format is not. Namely, the files you create won t have header information that identifies the original compressed file.

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

ASP NET includes two controls that allow website users to upload files to the web server Once the web server receives the posted file data, it s up to your application to examine it, ignore it, or save it to a back-end database or a file on the web server The controls that allow file uploading are HtmlInputFile (an HTML server control) and FileUpload (an ASPNET web control) Both represent the <input type="file"> HTML tag The only real difference is that the FileUpload control takes care of automatically setting the encoding of the form to multipart/form data If you use the HtmlInputFile control, it s up to you to make this change using the enctype attribute of the <form> tag if you don t, the HtmlInputFile control won t work Declaring the FileUpload control is easy.

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You can use one more technique to store data in a file serialization. Serialization is a higher-level model that s built on .NET streams. Essentially, serialization allows you to convert an entire live object into a series of bytes and write those bytes into a stream object such as the FileStream. You can then read those bytes back later to re-create the original object. For serialization to work, your object must all meet the following criteria: The object must have a Serializable attribute preceding the class declaration. All the Public, Protected, Internal and Private variables of the class must be serializable. If the class derives from another class, all parent classes must also be serializable. Here s a serializable class that you could use to store log information: <Serializable()> _ Public Class LogEntry Private strMessage As String Private dteDate As DateTime

Parent and Root CreateSubdirectory()

It doesn t expose any new properties or events that you can use through the control tag <asp:FileUpload ID="Uploader" runat="server" /> The <input type="file"> tag doesn t give you much choice as far as the user interface is concerned (it s limited to a text box that contains a filename and a Browse button) When the user clicks Browse, the browser presents an Open dialog box and allows the user to choose a file This behavior is hard-wired into the browser, and you can t change it Once the user selects a file, the filename is filled into the corresponding text box However, the file isn t uploaded yet that happens later, when the page is posted back At this point, all the data from all the input controls (including the file data) is sent to the server.

Public Property Message() As String Get Return strMessage End Get Set strMessage = Value End Set End Property Public Property DateTime() As String Get Return dteDate End Get Set dteDate = Value End Set End Property Public Sub New(ByVal strMessage As String) Me.strMessage = strMessage Me.dteDate = DateTime.Now End Sub End Class

Returns a DirectoryInfo object that represents the parent or root directory. Creates a directory with the specified name in the directory represented by the DirectoryInfo object. It also returns a new DirectoryInfo object that represents the subdirectory. Returns an array of DirectoryInfo objects that represent all the subdirectories contained in this directory. Returns an array of FileInfo objects that represent all the files contained in this directory.

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