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All the code is in one method as opposed to lots of methods spread out within a class . Since there is no class, there are no fields; all the variables are local variables . Where I would have had a method separation, I now have a yield return 1 statement . This allows the thread to return to where it came from so that it can do more work . To every BeginXxx method, I pass ae.End(); this method returns a delegate referring to a method inside the AsyncEnumerator object . When the operation completes, the thread pool thread notifies the AsyncEnumerator object, which in turn continues executing your iterator method after the yield return 1 statement . I always pass null as the last argument to every BeginXxx method . Therefore, I never need to call IAsyncResult s AsyncState property and cast its return value to the right type; I just use the local variables directly . To every EndXxx method, I pass the result of calling ae.DequeueAsyncResult() . This method returns the IAsyncResult object that was passed to the AsyncEnumerator object by the thread pool thread when the asynchronous operation completed . And last, but not least, notice that now I can use C# s using statement to control the lifetime of the NamedPipeServerStream . This also means that the NamedPipeServerStream object will be closed within a finally block should any other code throw an unhandled exception .

the model For example, the view model may combine the value of two fields to make it easier for the view to be presented, or it may calculate the number of characters remaining for input in fields with a maximum length The view model may also implement data validation logic to ensure data consistency The view model may define logical states the view can use to provide visual changes in the UI The view may define layout or styling changes that reflect the state of the view model For example, the view model may define a state that indicates that data is being submitted asynchronously to a web service The view can display an animation while it is in this state to provide visual feedback to the user Typically, the view model will define commands or actions that can be represented in the UI and that the user can invoke.

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The final panel in the inspector window is the Identity tab. Like the Connections tab, it s not of much use for this label, but we ll cover its functionality for the sake of completeness. Figure 12.6 shows what it looks like.

1. 2. 3. 4.

7

The output we get now looks like this:

15:

A common example is when the view model provides a Submit command that allows the user submit data to a web service or to a data repository The view might represent that command with a button so that the user can click the button to submit the data Typically, when the command becomes unavailable, its associated UI representation becomes disabled Commands provide a way to encapsulate user actions and to cleanly separate them from their visual representation in the UI To summarize, the view model has the following key characteristics: The view model is a non-visual class and does not derive from any WPF or Silverlight base class It encapsulates the presentation logic required to support a use case or user task in the application The view model is testable independently of the view and the model Typically, the view model does not reference the view directly.

Website certificates are the foundation of secure transactions on the Internet. When you visit a secure website in Internet Explorer, the padlock icon in the Address bar indicates that a digital certificate identifies the site; you can inspect the certificate s details by clicking the padlock icon and displaying the summary window shown on the next page.

Even with the Netstat output showing that several ports are listening, it s not necessarily clear what ports are tied to which services. Port assignments for the Internet Protocol are managed an assigned by the Internet Assigned Numbers Authority (IANA). IANA maintains a list of well-known port numbers that is useful for finding out which protocols use the various ports on a computer. The list can be found at http://www.vista-io.com/3101. From the IANA port number assignment list, it s possible to find that TCP port 3389 (from the output of the Netstat command) is usually used for MS-WBT Server, also known as Terminal Services or Remote Desktop. Even with the information from IANA about the ports that are generally used for a given service, there s no guarantee that port 3389 is actually being used for Remote Desktop. It s possible to configure services to listen on ports other than their own default port. Therefore, another option is necessary in order to truly determine what process is listening on a given port in Windows. This command will show the currently active ports along with their Process ID (PID):

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