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This is the type of process that simply can t be handled without using , and it must take place every time the model is instantiated, even when coming from the database. However, calling an extra method call on every access from the database can get quite expensive, so it s essential to be able to handle this without penalizing those fields that don t use it. As will be shown at the end of this chapter, a descriptor can be used to customize what happens when a field s value is accessed, which can be an excellent way to control this type of behavior. Of course, descriptors can be tricky if they re just a means to an end, and the

The following web application uses a global.asax file that responds to the Application_Error method. It intercepts the error and displays some information about it in a predefined format. <script language="C#" runat="server"> protected void Application_Error(Object sender, EventArgs e) { Response.Write("<b>"); Response.Write("Oops! Looks like an error occurred!!</b><hr />"); Response.Write(Server.GetLastError().Message.ToString()); Response.Write("<hr />" + Server.GetLastError().ToString()); Server.ClearError(); } </script> To test this application event handler, you need to create another web page that causes an error. Here s an example that generates an error by attempting to divide by zero when a page loads: protected { int i int j int k } void Page_Load(object sender, EventArgs e) = 0; = 1; = j/i;

If you request this page, you ll see the display shown in Figure 5-2.

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Figure 5-2. Catching an unhandled error Typically, you wouldn t use the Application_Error() method to control the appearance of a web page, because it doesn t give you enough flexibility to deal with different types of errors (without coding painstaking conditional logic). Instead, you would probably configure custom error pages using the web.config file (as described in the next section). However, Application_Error() might be extremely useful if you want to log an error for future reference or even send an e-mail about it to a system administrator. In fact, in many events you ll need to use techniques such as these because the Response object won t be available. Two examples include the Application_Start() and Application_End() methods.

Configuration in ASP.NET is managed with XML configuration files. All the information needed to configure an ASP.NET application s core settings, as well as the custom settings specific to your own application, is stored in these configuration files. The ASP.NET configuration files have several advantages over traditional ASP configuration: They are never locked: As described in the beginning of this chapter, you can update configuration settings at any point, and ASP.NET will smoothly transition to a new application domain. They are easily accessed and replicated: Provided you have the appropriate network rights, you can modify a configuration file from a remote computer (or even replace it by uploading a new version via FTP). You can also copy a configuration file and use it to apply identical settings to another application or another web server that runs the same application in a web farm scenario. They are easy to edit and understand: The settings in the configuration files are humanreadable, which means they can be edited and understood without needing a special configuration tool.

4. 5.

With ASP.NET, you don t need to worry about configuring the IIS metabase or restarting the web server. However, you still can t perform a few tasks with a web.config file. For example, you can t create or remove a virtual directory. Similarly, you can t change file mappings. If you want the ASP .NET service to process requests for additional file types (such as HTML or a custom file type you define), you must use IIS Manager, as described in 18.

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