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ASP .NET uses a lazy initialization technique for creating application domains. This means that the application domain for a web application is created the first time a request is received for a page or web service in that application. An application domain can shut down for a variety of reasons, including if the web server itself shuts down. But, more commonly, applications restart themselves in new application domains in response to error conditions or configuration changes. For example, depending on the settings in the computer-wide machine.config file, an ASP.NET application may be periodically recycled when certain thresholds are reached. This model is designed to keep an application healthy and to detect characteristics that could indicate a problem has developed. Depending on your machine.config settings, application domains may be recycled based on the length of time the application domain has been running, the number of queued requests, or the amount of memory used (as described in 18). ASP.NET automatically recycles application domains when you change the application. One example is if you modify the web.config file. Another example is if you replace an existing web-page file or DLL assembly file. In both of these cases, ASP.NET starts a new application domain to handle all future requests and keeps the existing application domain alive long enough to finish handling any outstanding requests (including queued requests).

Recall from 1 that the .NET type system is composed of classes, structures, enumerations, interfaces, and delegates. To begin exploration of these types, let s check out the role of the enumeration (or simply, enum) using a new Console Application project named FunWithEnums. When building a system, it is often convenient to create a set of symbolic names that map to known numerical values. For example, if you are creating a payroll system, you may want to refer to the type of employees using constants such as vice president, manager, contractor, and grunt. C# supports the notion of custom enumerations for this very reason. For example, here is an enumeration named EmpType: // A custom enumeration. enum EmpType { Manager, // = 0

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Tip You can programmatically shut down a web application domain using the Shared HttpRuntime. UnloadAppDomain() method. (The application will restart itself automatically the next time it receives a request.) This technique is rarely used, but it can be useful if you re hosting a number of web applications on the same server and some are used only infrequently. In this case, the memory overhead of keeping the application domain alive may outweigh the increased speed of serving subsequent requests into the application.

Grunt, Contractor, VicePresident }

control = new UserControlImpl(model,this); } private function handleSearchMethod(event:ItemClickEvent):void { columnNameToSearch = event.currentTarget.selectedValue as String; } ]]> </mx:Script> </mx:Application> Now you can run the server, compile the Flex GUI, and try to login as administrator and then as a user to see the differences.

One of the most remarkable features about the ASP .NET execution model is that you can update your web application without needing to restart the web server and without worrying about harming existing clients. This means you can add, replace, or delete files in the virtual directory at any time. ASP.NET then performs the same transition to a new application domain that it performs when you modify the web.config configuration file. Being able to update any part of an application at any time, without interrupting existing requests, is a powerful feature. However, it s important to understand the architecture that makes it possible. Many developers make the mistake of assuming that it s a feature of the CLR that allows ASP .NET to seamlessly transition to a new application domain. But in reality, the CLR always locks assembly files when it executes them. To get around this limitation, ASP .NET doesn t actually use the ASP .NET files in the virtual directory. Instead, it uses another technique, called shadow copy, during the compilation process to create a copy of your files in c:\[WinDir]\Microsoft.NET\[Version]\Temporary ASP .NET Files. The ASP .NET worker process loads the assemblies from this directory, which means these assemblies are locked. The second part of the story is ASP.NET s ability to detect when you change the original files. This detail is fairly straightforward it simply relies on the ability of the Windows operating system to track directories and files and send immediate change notifications. ASP .NET maintains an active list of all assemblies loaded within a particular application s application domain and uses monitoring code to watch for changes and acts accordingly.

// = 1 // = 2 // = 3

The EmpType enumeration defines four named constants, corresponding to discrete numerical values. By default, the first element is set to the value zero (0), followed by an n + 1 progression. You are free to change the initial value as you see fit. For example, if it made sense to number the members of EmpType as 102 through 105, you could do so as follows: // Begin with 102. enum EmpType { Manager = 102, Grunt, // = 103 Contractor, // = 104 VicePresident // = 105 } Enumerations do not necessarily need to follow a sequential ordering, and need not have unique values. If (for some reason or another) it makes sense to establish your EmpType as shown here, the compiler continues to be happy: // Elements of an enumeration need not be sequential! enum EmpType { Manager = 10, Grunt = 1, Contractor = 100, VicePresident = 9 }

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