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Table 1-1: Fragment of an ASP.NET Page Trace Category aspx.page Message End ProcessPostD ata Page_Load event handler started Page_Load event handler exit From First(s) 0.000551 From Last(s) 0.000158
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The last two entries in Table 1-1 are custom Trace messages written using the Page.Trace.Write(...) method. Easy application deployment and maintenance Applications are often made up of several components: Web pages Windows forms-based components Web services Components housed in DLLs The .NET Framework makes it possible to install applications that use some or all of these components without having to register DLLs (using regsvr32.exe) or to create Registration Database (also known as the system Registry) entries. The .NET Framework makes it easy to deploy applications using zero-impact installation often all that's required to install an application is to copy it into a directory along with the components it requires. This is possible because the .NET Framework handles the details of locating and loading components an application needs, even if you have several versions of the same component available on a single system. All of this is possible because the .NET Framework records extra information about an application's components the extra information is called metadata. A component of the .NET Framework, the Class Loader, inspects an application's metadata and ensures that all of the components the application depends on are available on the system before the application begins to execute. This feature of the .NET Framework works to isolate applications from each other despite changes in system configuration, making it easier to install and upgrade applications. Once an application is running on a system, it is sometimes necessary to change certain traits of the application, such as its security requirements, optional parameters, and even database connections. .NET Framework applications use a configuration model based on application-configuration files. A configuration file is a text file that contains XML elements that affect the behavior of an application. For example, an administrator can configure an application to use only a certain version of a component the application relies on, thereby ensuring consistent behavior regardless of how often the component is upgraded. The following code shows an ASP.NET's basic configuration file; the file is called web.config: <configuration> <system.web> <pages buffer="true" enableSessionState="true" /> <appSettings> <add key="dsn" value="localhost;uid=sa;pwd="/>
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</appSettings> </system.web> </configuration> This code shows that the ASP.NET application will have page buffering on (pages will be sent to clients only when the page is completely rendered), and that ASP.NET will track individual clients' session information (as shown in the pages tag). This code also demonstrates how to define a custom configuration key, called dsn within the appSettings section, which applications have access to through the TraceSwitch class.
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The .NET Framework consists of three key elements (as shown in Figure 1-1):
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Figure 1-1: Components of the .NET Framework Common Language Runtime .NET Class Library Unifying components Common Language Runtime The Common Language Runtime (CLR) is a layer between an application and the operating system it executes on. The CLR simplifies an application's design and reduces the amount of code developers need to write because it provides a variety of execution services that include memory management, thread management, component lifetime management, and default error handling. The key benefit of the CLR is that it transparently provides these execution services to all applications, regardless of what programming language they're written in and without any additional effort on the part of the developer. The CLR is also responsible for compiling code just before it executes. Instead of producing a binary representation of your code, as traditional compilers do, .NET compilers produce a representation of your code in a language common to the .NET Framework: Microsoft Intermediate Language (MSIL), often referred to as IL. When your code executes for the first time, the CLR invokes a special compiler called a Just In Time (JIT) compiler, which transforms the IL into executable instructions that are specific to the type and model of your system's processor. Because all .NET languages have the same compiled representation, they all have similar performance characteristics. This means that a program written in Visual Basic .NET can perform as well as the same program written in Visual C++ .NET. (C++ is the language of choice for developers who need the best possible performance a system can deliver.)
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