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Sub Main(ByVal args As String()) Console.WriteLine("***** Adding with Thread objects *****") Console.WriteLine("ID of thread in Main(): {0}", _ Thread.CurrentThread.GetHashCode()) Dim ap As AddParams = New AddParams(10, 10) Dim t As Thread = New Thread(New ParameterizedThreadStart(AddressOf Add)) t.Start(ap) Console.ReadLine() End Sub End Module As in the previous example, you have the option of directly creating an instance of the ParameterizedThreadStart delegate, or allowing the Thread type to do so on your behalf. Therefore, we could allocate our new Thread object as follows: ' This time, because Add() is a method taking a System.Object, ' a new ParameterizedThreadStart delegate is created ' behind the scenes. Dim t As Thread = New Thread(AddressOf Add)

The design principles to keep in mind for the second tenet are as follows: Service versioning and deployment are independent of the system in which they are deployed. Contracts, once published, should not be changed. Adopt a pessimistic approach, and isolate services from failure.

If you do make the decision to distribute your product as a universal application, it requires some extra planning and effort on your part..

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Now that you have seen how to programmatically create new threads of execution using the System.Threading namespace, let s formalize the distinction between foreground threads and background threads: Foreground threads have the ability to prevent the current application from terminating. The CLR will not shut down an application (which is to say, unload the hosting AppDomain) until all foreground threads have ended. Background threads (sometimes called daemon threads) are viewed by the CLR as expendable paths of execution that can be ignored at any point in time (even if they are currently laboring over some unit of work). Thus, if all foreground threads have terminated, any and all background threads are automatically killed when the application domain unloads. It is important to note that foreground and background threads are not synonymous with primary and worker threads. By default, every thread you create via the Thread.Start() method is automatically a foreground thread. Again, this means that the AppDomain will not unload until all threads of execution have completed their units of work. In most cases, this is exactly the behavior you require. For the sake of argument, however, assume that you wish to invoke Printer.PrintNumbers() on a secondary thread that should behave as a background thread. Again, this means that the method pointed to by the Thread type (via the ThreadStart or ParameterizedThreadStart delegate) should be able to halt safely as soon as all foreground threads are done with their work. Configuring such a thread is as simple as setting the IsBackground property to True: Sub Main() Console.WriteLine("***** Background Threads *****") Console.WriteLine()

Dim p As Printer = New Printer() Dim bgroundThread As Thread = New Thread(AddressOf p.PrintNumbers) bgroundThread.IsBackground = True bgroundThread.Start() End Sub Notice that this Main() method is not making a call to Console.ReadLine() to force the console to remain visible until you press the Enter key. Thus, when you run the application, it will shut down immediately because the Thread object has been configured as a background thread. Given that the Main() method triggers the creation of the primary foreground thread, as soon as the logic in Main() completes, the AppDomain unloads before the secondary thread is able to complete its work. However, if you comment out the line that sets the IsBackground property, you will find that each number prints to the console, as all foreground threads must finish their work before the AppDomain is unloaded from the hosting process. For the most part, configuring a thread to run as a background type can be helpful when the worker thread in question is performing a noncritical task that is no longer needed when the main task of the program is finished.

s Note Business Process Execution Language (BPEL) is a business process language that is based on XML

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