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HttpApplication is the base class that represents a running ASP.NET application. A derived HTTP application class is dynamically generated by parsing the contents of the global.asax file, if any is present. If global.asax is available, the application class is built and named after it: ASP.global_asax. Otherwise, the base HttpApplication class is used. An instance of an HttpApplication-derived class is responsible for managing the entire lifetime of the request it is assigned to. The same instance can be reused only after the request has been completed. The HttpApplication maintains a list of HTTP module objects that can filter and even modify the content of the request. Registered modules are called during various moments of the elaboration as the request passes through the pipeline. The HttpApplication object determines the type of object that represents the resource being requested typically, an ASP.NET page, a Web service, or perhaps a user control. HttpApplication then uses the proper handler factory to get an object that represents the requested resource. The factory either instantiates the class for the requested resource from an existing assembly or dynamically creates the assembly and then an instance of the class. A handler factory object is a class that implements the IHttpHandlerFactory interface and is responsible for returning an instance of a managed class that can handle the HTTP request an HTTP handler. An ASP.NET page is simply a handler object that is, an instance of a class that implements the IHttpHandler interface. Let s see what happens when the resource requested is a page.

New Single() {0, 0, 0, transparency, 0}, _

When the HttpApplication object in charge of the request has figured out the proper handler, it creates an instance of the handler factory object. For a request that targets a page, the factory is a class named PageHandlerFactory. To find the appropriate handler, HttpApplication uses the information in the <httpHandlers> section of the configuration file as a complement to the information stored in the IIS handler mappings list, as shown in Figure 5-3.

New Single() {0, 0, 0, 0, 1}}

Bear in mind that handler factory objects do not compile the requested resource each time it is invoked. The compiled code is stored in an ASP.NET temporary directory on the Web server and used until the corresponding resource file is modified. So the page handler factory creates an instance of an object that represents the particular page requested. As mentioned, the actual object inherits from the System.Web.UI.Page class, which in turn implements the IHttpHandler interface. The page object is returned to the application factory, which passes that back to the HttpRuntime object. The final step accomplished by the ASP.NET runtime is calling the IHttpHandler s ProcessRequest method on the page object. This call causes the page to execute the user-defined code and generate the markup for the browser. In 17, ASP.NET State Management, we ll return to the initialization of an ASP.NET application, the contents of global.asax, and the information stuffed into the HTTP context a container object, created by the HttpRuntime class, that is populated, passed along the pipeline, and finally bound to the page handler.

Dim colMatrix As New ColorMatrix(values)

There are a few reasons why an ASP.NET application can be restarted. For the most part, an application is restarted to ensure that latent bugs or memory leaks don t affect the overall behavior of the application in the long run. Another reason is that too many changes dynamically made to deployed ASPX pages might have caused too large a number of assemblies (typically, one per page) to be loaded in memory. Note that any applications that consume more than a certain share of virtual memory are automatically killed and restarted by IIS. In IIS 7, you can even configure a periodic recycle to ensure that your application is always lean, mean, and in good shape. Furthermore, the hosting environment (IIS or ASP.NET, depending on the configuration) implements a good deal of checks and automatically restarts an application if any the following scenarios occur:

the Action property contains a value, as shown here:

The maximum limit of dynamic page compilations is reached. This limit is configurable through the web.config file. The physical path of the Web application has changed, or any directory under the Web application folder is renamed. Changes occurred in global.asax, machine.config, or web.config in the application root, or in the Bin directory or any of its subdirectories. Changes occurred in the code-access security policy file, if one exists. Too many files are changed in one of the content directories. (Typically, this happens if files are generated on the fly when requested.) You modified some of the properties for the application pool hosting the Web application.

Dim imageAttr As New ImageAttributes()

In addition to all this, in ASP.NET an application can be restarted programmatically by calling HttpRuntime.UnloadAppDomain.

Part IV:

Processing directives configure the run-time environment that will execute the page. In ASP.NET, directives can be located anywhere in the page, although it s a good and common practice to place them at the beginning of the file. In addition, the name of a directive is case insensitive and the values of directive attributes don t need to be quoted. The most important and most frequently used directive in ASP.NET is @Page. The complete list of ASP.NET directives is shown in Table 5-3.

imageAttr.SetColorMatrix(colMatrix, ColorMatrixFlag.Default, _ ColorAdjustType.Bitmap) Draw the bitmap using the specified ImageAttributes object. gr.DrawImage(bmp, New Rectangle(200, 20, bmp.Width, bmp.Height), _ 0, 0, bmp.Width, bmp.Height, GraphicsUnit.Pixel, imageAttr)

TABLE 5-3