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The item is archived. Applications can use this attribute to mark files for backup or removal, although it s really just a holdover from older DOS-based operating systems. The item is compressed. Not currently used. Reserved for future use. The item is a directory. This item is encrypted. For a file, this means that all data in the file is encrypted. For a directory, this means that encryption is the default for newly created files and directories. This item is hidden and thus is not included in an ordinary directory listing. However, you can still see it in Windows Explorer. This item is normal and has no other attributes set. This attribute is valid only if used alone. This item will not be indexed by the operating system s content indexing service. This file is offline and not currently available. This item is read-only. This file contains a reparse point, which is a block of user-defined data associated with a file or a directory in an NTFS file system.

he core set of ASP NET controls is broad and impressive It includes controls that encapsulate basic HTML tags and controls that provide a rich higher-level model, such as the Calendar, TreeView, and data controls Of course, even the best set of controls can t meet the needs of every developer Sooner or later, you ll want to get under the hood, start tinkering, and build your own user interface components In NET, you can plug into the web forms framework with your own controls in two ways You can develop either of the following: User controls: A user control is a small section of a page that can include static HTML code and web server controls The advantage of user controls is that once you create one, you can reuse it in multiple pages in the same web application You can even add your own properties, events, and methods.

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// Write the message. // A using block ensures the file is automatically closed, // even in the case of error. string fileName = (string)ViewState["LogFile"]; using (FileStream fs = new FileStream(fileName, mode)) { StreamWriter w = new StreamWriter(fs); w.WriteLine(DateTime.Now); w.WriteLine(message); w.Close(); } } For example, a log message is added every time the page is loaded, as shown here: protected void Page_Load(object sender, System.EventArgs e) { if (!Page.IsPostBack) { Log("Page loaded for the first time."); } else { Log("Page posted back."); } } The last ingredients are two button event handlers that allow you to delete the log file or show its contents, as follows: protected void cmdRead_Click(object sender, System.EventArgs e) { if (ViewState["LogFile"] != null) { string fileName = (string)ViewState["LogFile"]; using (FileStream fs = new FileStream(fileName, FileMode.Open)) { StreamReader r = new StreamReader(fs); // Read line by line (allows you to add // line breaks to the web page). string line; do { line = r.ReadLine(); if (line != null) { lblInfo.Text += line + "<br>"; } } while (line != null); r.Close(); } } } protected void cmdDelete_Click(object sender, System.EventArgs e) {

The file is a sparse file. Sparse files are typically large files with data consisting of mostly zeros. This item is supported only on NTFS file systems. The item is part of the operating system or is used exclusively by the operating system. This item is temporary and can be deleted when the application is no longer using it.

Custom server controls: Custom server controls are compiled classes that programmatically generate their own HTML Unlike user controls (which are declared like web-form pages in a plain-text file), server controls are always precompiled into DLL assemblies Depending on how you code the server control, you can render the content from scratch, inherit the appearance and behavior from an existing web control and extend its features, or build the interface by instantiating and configuring a group of constituent controls In this chapter, you ll explore the first option user controls User controls are a great way to standardize repeated content across all the pages in a website For example, imagine you want to provide a consistent way for users to enter address information on several different pages To solve this problem, you could create an address user control that combines a group of text boxes and a few related validators.

if (ViewState["LogFile"] != null) { File.Delete((string)ViewState["LogFile"]); } } Figure 13-4 shows the web page displaying the log contents.

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