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Depending on the template you select for your database, you might see the Home window when you open a database application. The Home window offers you quick-look information, providing a summary of the data in the current database. Charts spotlight important data trends; lists related to the content and focus of the application (such as Active Orders and Inventory to Reorder, shown in Figure 9-6) appear in the Home window.
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Sets the startup type for the Windows Remote Management (WinRM) service to Automatic (Delayed Start) Starts the Windows Remote Management service Creates a WinRM listener to accept incoming requests that use the WSManagement protocol Enables the exception in Windows Firewall for Windows Remote Management
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You define a user control property as you would any other class-level property in the .NET Framework. For example, to add the UserId and AddressType properties to the Address user control, you would add code as follows to the user control s class.
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If you were to compile this code and examine the resulting assembly with ILDasm.exe, you d see that the C# compiler did, in fact, emit a method named Finalize into the module s metadata. If you examined the Finalize method s IL code, you d also see that the call to CloseHandle was emitted into a try block and that a call to base.Finalize was emitted into a finally block. To create an instance of the OSHandle object, you d first have to call a Win32 function that returns a handle to an unmanaged resource, such as CreateFile, CreateMutex, CreateSemaphore, CreateEvent, socket, CreateFileMapping, and so on. Then you d use C# s new operator to construct an instance of OSHandle, passing the Win32 handle to the constructor. Sometime in the future, the garbage collector will determine that this object is garbage. When that happens, the garbage collector will see that the type has a Finalize method and will call the method, allowing CloseHandle to close the unmanaged resource. Sometime after Finalize returns, the memory occupied in the managed heap by the OSHandle object will be reclaimed. Important If you re familiar with C++, you ll notice that the special syntax that C# requires for defining a Finalize method looks just like the syntax you d use to define a C++ destructor. In fact, the C# Programming Language Specification even calls this method a destructor. However, a Finalize method doesn t work at all like an unmanaged C++ destructor. I think it was a mistake for the C# compiler team to mimic the C++ destructor syntax and to call this method a destructor. Using the unmanaged C++ nomenclature has been incredibly confusing to C++ programmers who are now adopting C# and the .NET Framework. These developers mistakenly believe that using the C# destructor syntax means that the type s objects will be deterministically destructed, just as they would be in C++. However, the CLR doesn t support deterministic destruction and therefore C# can t provide this mechanism. In fact, no programming language that supports the CLR can offer this. Even if you define a managed type using Microsoft s C++ with Managed Extensions, defining a destructor method causes the compiler to emit a Finalize method that gets called only when a garbage collection occurs. Don t let a language s destructor syntax fool you a Finalize method gets called only when a garbage collection occurs; it won t get called when a method exits or at the point when the object goes out of scope. When designing a type, it s best if you avoid using a Finalize method, for several reasons: Finalizable objects get promoted to older generations, which increases memory pressure and prevents the object s memory from being collected at the time when the garbage collector determines the object is garbage. In addition, all objects referred to directly or indirectly by this object get promoted as well. (I ll talk about generations and promotions later in this chapter.) Finalizable objects take longer to allocate because pointers to them must be placed on the finalization list (which I ll discuss in the Finalization Internals section a little later). Forcing the garbage collector to execute a Finalize method can hurt performance significantly. Remember, each object is finalized. So if I have an array of 10,000 objects, each object must have its Finalize method called. A finalizable object can refer to other (finalizable and nonfinalizable) objects, prolonging their lifetime unnecessarily. In fact, you might want to consider breaking a type into two different types: a lightweight type with a Finalize method that doesn t refer to any other objects (just like the OSHandle type shown earlier) and a separate type without a Finalize method that 359
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For this parameter, you pass the name of a method (or lambda expression) representing code that you want to be executed by a thread pool thread when the asynchronous I/O operation completes . The last parameter to a BeginXxx method, stateObject, is a reference to any object you d like forwarded on to your callback method . Inside your callback method, you access your objectState by querying the IAsyncResult interface s read-only AsyncState property . All BeginXxx methods return an object that implements the System .IAsyncResult interface . When you call a BeginXxx method, it constructs an object that uniquely identifies your I/O request, queues up the request to the Windows device driver, and returns to you a reference to the IAsyncResult object . You can think of this object as your receipt . You can actually ignore the object reference returned from BeginXxx because the CLR internally holds a reference to the IAsyncResult object as well . When the operation completes, a thread pool thread will invoke your callback method, passing to it a reference to the internally held IAsyncResult object . Inside your method, you ll call the corresponding EndXxx method, passing it the IAsyncResult object . The EndXxx method returns the same result that you would have gotten if you had called the synchronous method . For example, FileStream s Read method returns an Int32 that indicates the number of bytes actually read from the stream . FileStream s EndRead method s return value has the same meaning:
Imagine that you re reading a UTF-16 encoded string via a System.Net.Sockets. NetworkStream object . The bytes will very likely stream in as chunks of data . In other words, you might first read 5 bytes from the stream, followed by 7 bytes . In UTF-16, each character consists of 2 bytes . So calling Encoding s GetString method passing the first array of 5 bytes will return a string consisting of just two characters . If you later call GetString, passing in the next 7 bytes that come in from the stream, GetString will return a string consisting of three characters, and all of the code points will have the wrong values! This data corruption problem occurs because none of the Encoding-derived classes maintains any state in between calls to their methods . If you ll be encoding or decoding characters/bytes in chunks, you must do some additional work to maintain state between calls, preventing any loss of data . To decode chunks of bytes, you should obtain a reference to an Encoding-derived object (as described in the previous section) and call its GetDecoder method . This method returns a reference to a newly constructed object whose type is derived from the System.Text.Decoder class . Like the Encoding class, the Decoder class is an abstract base class . If you look in the .NET Framework SDK documentation, you won t find any classes that represent concrete implementations of the Decoder class . However, the FCL does define a bunch of Decoder-derived classes . These classes are all internal to the FCL, but
registeredserver command to register the server in a domain in which the answering router is a member or other domains. Alternatively, you or your domain administrator can add the computer account of the answer ing router computer to the RAS and IAS Servers security group of all the domains that contain user accounts for which the answering router is authenticating site-to-site VPN connections.
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public sealed class MyType { public override String ToString() { return null; } }
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