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The Logger class locks itself before accessing the log file, creating a critical section This ensures that only one thread can execute the LogMessage() code at a time, removing the danger of file conflicts However, for this to work you must make sure every class is using the same instance of the Logger object You have a number of options here for example, you could respond to the HttpApplicationStart event in the globalasax file to create a global instance of the Logger class and store it in the Application collection Alternatively, you could expose a single Logger instance through a static variable in the globalasax file, as shown here: private log = new Logger(); public Logger Log { get { return Logger; } } Now any page that uses the Logger to call LogMessage() gets exclusive access: // Update the file safely ApplicationLog.

User control (.ascx) files are similar to ASP .NET web-form (.aspx) files. Like web forms, user controls are composed of a user interface portion with control tags (the .ascx file) and can use inline script or a .vb code-behind file. User controls can contain just about anything a web page can, including static HTML content and ASP.NET controls, and they also receive the same events as the Page object (like Load and PreRender) and expose the same set of intrinsic ASP.NET objects through properties (such as Application, Session, Request, and Response). The key differences between user controls and web pages are as follows: User controls begin with a Control directive instead of a Page directive. User controls use the file extension .ascx instead of .aspx, and their code-behind files inherit from the System.Web.UI.UserControl class. In fact, the UserControl class and the Page class both inherit from the same TemplateControl class, which is why they share so many of the same methods and events. User controls can t be requested directly by a client. (ASP.NET will give a generic that file type is not served error message to anyone who tries.) Instead, user controls are embedded inside other web pages.

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Some attributes can t be set programmatically. For example, the Encrypted attributed is set by the operating system only if you are using EFS (Encrypting File System) to encrypt files.

LogMessage(myMessage); Keep in mind that this approach is really just a crude way to compensate for the inherit limitations of a file-based system It won t allow you to manage more complex tasks, such as having individual users read and write pieces of text in the same file at the same time Additionally, while a file is locked for one client, other requests will have to wait This is guaranteed to slow down application performance and lead to an exception if the object isn t released before the second client times out Unless you invest considerable effort refining your threading code (for example, you can use classes in the SystemThreading namespace to test if an object is available and take alternative action if it isn t), this technique is suitable only for small-scale web applications It s for this reason that ASP .

To create a user control in Visual Studio, select Website Add New Item, and choose the Web User Control template. The following is the simplest possible user control one that merely contains static HTML. This user control represents a header bar. <%@ Control Language="vb" AutoEventWireup="true" CodeFile="Header.ascx.vb" Inherits="Header" %> <table width="100%" border="0" bgcolor="blue"> <tr> <td><font face="Verdana,Arial" size="6" color="yellow"><b> User Control Test Page</b></font> </td> </tr> <tr> <td align="right"><font size="3" color="white"><b> An Apress Creation (c) 2005</b></font>    </td> </tr> </table> You ll notice that the Control directive identifies the code-behind class. However, the simple header control doesn t require any custom code to work, so you can leave the class empty: Public Partial Class Header Inherits System.Web.UI.UserControl End Class

The DirectoryInfo and Directory objects both provide a way to search the current directories for files or directories that match a specific filter expression. These search expressions can use the standard and * wildcards. The wildcard represents any single character, and the * wildcard represents any sequence of zero or more characters. For example, the following code snippet retrieves the names of all the files in the c:\temp directory that have the extension .txt. The code then iterates through the retrieved FileInfo collection of matching files and displays the name and size of each one. DirectoryInfo dir = new DirectoryInfo(@"c:\temp"); // Get all the files with the .txt extension. FileInfo[] files = dir.GetFiles("*.txt"); // Process each file. foreach (FileInfo file in files) { ... } You can use a similar technique to retrieve directories that match a specified search pattern by using the overloaded DirectoryInfo.GetDirectories() method. The GetFiles() and GetDirectories() methods search only the current directory. If you want to perform a search through all the contained subdirectories, you d need to use recursive logic.

NET applications almost never use file-based logs instead, they write to the Windows event log or a database..

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