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At a lower level of abstraction, however, the only thing NET Remoting can do for you is enable communication and data exchange between different application domains (AppDomains) Application Domains The NET Framework CLR provides a feature-rich execution environment for code Within the CLR, code finds available services like garbage collection, security, versioning, and threading Executable code must be loaded into the CLR to be managed while running, however Note Currently, only the Microsoft Windows XP operating system is equipped with a CLR-aware program loader capable of running a NET Framework executable within the context of a CLR instance For compatibility with all non-XP Windows operating systems, all NET Framework executables include a tailor-made stub program that operating systems automatically launch when executables don't match the current system platform This stub passes the control to another piece of code that instantiates the CLR and loads the managed code into it.

Table A-1 shows the function numbers (function_num) for each of the available aggregates used in the SUBTOTAL function.

On the Size tab, which you can see in Figure 3-23, specify height and width in inches or use the scale options to set a percentage. You can also rotate the WordArt.

See the section "Further Reading," on page 559, for additional resources on this topic..

101 102 103 104 105 107 109 110

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To run an application's code, the instance of the CLR must obtain a pointer to an AppDomain. AppDomains are separate units of processing that the CLR recognizes in a running process. All .NET Framework processes run at least one AppDomain known as the default AppDomain that is created during the CLR initialization. An application can have additional AppDomains. Each AppDomain is independently configured and given personal settings for security, reference paths, and configuration files. AppDomains are separated and isolated from one another in a way that resembles process separation in Win32. The CLR enforces isolation by preventing direct calls between objects residing in different AppDomains. From the CPU perspective, AppDomains are much more lightweight than Win32 processes and provide for a more lightweight mechanism of isolation between processing units. The .NET Framework provides the remoting API as a tailor-made set of system services to access an object that resides in an external AppDomain. Figure 12-1 illustrates such an inter-AppDomain communication. 426

Figure 12-1: Inter-AppDomain communication in the .NET Framework. Why AppDomains Do It Better Managed code needs an AppDomain to run, but it must also pass through a verification process before it can be run. Code that passes such a test is said to be type-safe. Type-safe code never reads memory that has not been previously written, never calls a method using an incorrect number of arguments, and always assigns a return value to functions. In summary, type-safe code can't cause memory faults, which in Win32 were one of the reasons to have a physical separation between process memory contexts. The certainty of running type-safe code allows the CLR to provide a level of isolation as strong as process boundaries, but more cost-effective because an AppDomain is a logical process and as such is more lightweight than a true process. Note Direct use of pointers is allowed in C# as long as you explicitly mark your code (classes, methods, and interfaces) as unsafe by using the unsafe keyword. Unsafe code loads and runs in an AppDomain, just like managed code, but isn't verified to be type-safe. Unsafe code is supported by the C# compiler only.

Note In case you re wondering, the missing function numbers (function_num) are PRODUCT (106), which

Unlike Win32 processes, you can have several AppDomains running within the boundaries of the same .NET Framework application. Individual domains can be stopped without stopping the entire process, but you can't unload only a single assembly within an AppDomain. Managed code running in an AppDomain is carried out by a particular thread. However, threads and AppDomains are orthogonal entities in the sense that you can have several threads active during the execution of the AppDomain's code, but a single thread is in no way limited to running only within the context of a given AppDomain. Location Transparency From an application's standpoint, an external AppDomain can transparently be another AppDomain in the same process, the default AppDomain in another process on the same machine, and even an AppDomain residing on a physically distant machine. All the low-level details that make each of these scenarios unique are transparently 427

The Layout tab of the Format WordArt dialog box, shown in Figure 3-24, functions the same as the Layout tab in the Format Picture dialog box.

handled by .NET Remoting; the user is responsible only for higher-level aspects such as actual network paths or the URLs used to set up the communication.

multiplies all the arguments; STDEVP (108), the standard deviation of a population; and VARP (111), the variance of a population. If you use function numbers 1 11, the SUBTOTAL function includes hidden values; function numbers 101 111 hide hidden values.

The overall architecture that makes .NET Remoting happen is extremely modular and flexible enough to let you customize several aspects of the service. For example, you can decide whether remote objects should be marshaled on the local platform by value or by reference. Similarly, you can control how objects are activated and whether the activation should take place on the client or on the server. Programmers also can intervene in the object's lifetime and specify the most suitable communications channel and formatter module for transporting messages to and from remote applications. A remotable object can be implemented in one of two ways. One possibility is that you design the class to be serializable so that its instance data can be marshaled from the server to the client. At the receiving end, the client unmarshals the data and creates another instance of the class with the same values as the instance on the server. This approach is referred to as marshal by value (MBV). The other possibility is that the class allows for its object reference to be marshaled. When unmarshaled on the client, the object reference becomes a proxy to the remote instance. This second approach is known as marshal by reference (MBR). Unlike MBV, MBR preserves the object's identity. No matter how you design your remotable objects MBV or MBR a network connection must always exist between the client application and the remote object for .NET Remoting to work. Note .NET Remoting doesn't support the automatic download of the assembly containing the type of the instance that is being marshaled (unlike other remote access technologies, such as Java's Remote Method Invocation [RMI]). Instead, the assembly for the type needs to exist on the client beforehand. How the assembly gets on the client is outside the purview of .NET Remoting.

When you re adding records to the list, you might find it easier to toggle the Totals row off. To do that, just click the Toggle Totals Row button on the List toolbar again.

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