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While this may look like simply a way to delete a file, it actually serves a very particular purpose, which is alluded to by the presence of a argument. The method of sets up this method as a listener for the signal. It s not intended to be called individually, but instead it gets called every time a model instance with a is deleted. As described for , the argument is the object that was just deleted, and the argument is the model class for that instance. When triggered, it checks to see if the file referenced by this field on the specified instance should be deleted. After all, if no other instances are referencing the same file, and it s not the default values for new instances, it s quite likely that no references to the file remain. In those cases, the file is permanently removed from the storage system. The uses for overriding this are clear, because the logic for when to delete the file is included directly within this method. If a subclass needs to have different rules for this, simply overriding this method is enough to make it happen. The obvious example is if files should always remain, for historical reasons, even after the model instances associated with them have been deleted. Providing that behavior is a simple matter of just defining an empty implementation of this method.

If you re using the App_Code approach instead of a separately compiled assembly, you can omit the DLL name entirely, because ASP.NET generates it automatically. <httpHandlers> <add verb="*" path="test.simple" type="HttpExtensions.SimpleHandler" /> </httpHandlers> Visual Studio doesn t allow you to launch your HTTP handler directly. Instead, you need to run your web project and then type in a URL that includes test.simple. For example, if your web application URL is set to http://localhost:19209/05 in the local server, you need to manually change it to http://localhost:19209/05/test.simple. You ll see the HTML shown in Figure 5-12.

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Figure 5-12. Running a custom HTTP handler Using a custom HTTP handler isn t as convenient when you deploy your web application to an IIS web server. The problem is that the .simple extension won t be recognized by IIS. This means that by default it s handled by IIS on its own, not by ASP.NET. IIS simply checks for a file with that name, and if it exists, IIS returns the raw data from the file. If it doesn t, IIS returns an error message. To change this behavior, you need to add an IIS file mapping for your application that explicitly tells IIS to send all .simple requests to ASP.NET. 18 walks you through the process.

Instead of using a web.config or machine.config file, ASP.NET provides an alternate approach for registering HTTP handlers you can use the recognized extension .ashx. All requests that end in .ashx are automatically recognized as requests for a custom HTTP handler. To create an .ashx file in Visual Studio, select Website Add New Item and choose Generic Handler (see Figure 5-13). The .ashx file begins with a WebHandler directive. This WebHandler directive indicates the class that should be exposed through this file. Here s an example: <%@ WebHandler Language="C#" Class="HttpExtensions.SimpleHandler" %> The class name can correspond to a class in the App_Code directory or a class in a reference assembly. Alternatively, you can define the class directly in the .ashx file (underneath the WebHandler directive). Either way, when a client requests the .ashx file, the corresponding HTTP handler class is executed. If you save the previous example as the file simple.ashx, whenever the client requests simple.ashx your custom web handler will be executed. Best of all, the .ashx file type is registered in IIS, so you don t need to perform any IIS configuration when you deploy your application.

Of course, there are other possible use cases for this as well, but the specifics of what those would look like will depend very much on the needs of an individual application.

Figure 5-13. Creating an .ashx file Whether you use a configuration file or an .ashx file is mostly a matter of preference. However, .ashx files are usually used for simpler extensions that are designed for a single web application. Configuration files also give you a little more flexibility. For example, you can register an HTTP handler to deal with all requests that end with a given extension, whereas an .ashx file only serves a request if it has a specific filename. Also, you can register an HTTP handler for multiple applications (by registering it in the web.config file and installing the assembly in the GAC). To achieve the same effect with an .ashx file, you need to copy the .ashx file to each virtual directory.

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