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Note Although the thread pool has a set of workers at the ready, it can run out if there are a large number of asynchronous tasks underway at once, in which case the later ones will be queued until a thread is free. This prevents the computer from being swamped (say, with hundreds of separate threads), at which point the overhead of managing the threads would impede the CPU from performing other work.

Another issue in message systems is correctly sequencing and maintaining the right correlation among messages. Sequencing means that messages arrive in the same order as they re sent, as Figure 1-2 illustrates.

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You handle the DoWork event and begin your time-consuming task. However, you need to be careful not to access shared data (such as fields in your page class) or user interface objects. Once the work is complete, the BackgroundWorker fires the RunWorkerCompleted event to notify your application. This event fires on the dispatcher thread, which allows you to access shared data and your user interface, without incurring any problems. Once the BackgroundWorker acquires the thread, it fires the DoWork event. You can handle this event to call the Worker.FindPrimes() method. The DoWork event provides a DoWorkEventArgs object, which is the key ingredient for retrieving and returning information. You retrieve the input object through the DoWorkEventArgs.Argument property and return the result by setting the DoWorkEventArgs.Result property. Private Sub backgroundWorker_DoWork(ByVal sender As Object, _ ByVal e As DoWorkEventArgs) ' Get the input values. Dim input As FindPrimesInput = CType(e.Argument, FindPrimesInput) ' Start the search for primes and wait. ' This is the time-consuming part, but it won't freeze the ' user interface because it takes place on another thread. Dim primes As Integer() = Worker.FindPrimes(input.FromNumber, input.ToNumber) ' Return the result. e.Result = primes End Sub Once the method completes, the BackgroundWorker fires the RunWorkerCompletedEventArgs on the dispatcher thread. At this point, you can retrieve the result from the RunWorkerCompletedEventArgs.Result property. You can then update the interface and access page-level variables without worry. Private Sub backgroundWorker_RunWorkerCompleted(ByVal sender As Object, _ ByVal e As RunWorkerCompletedEventArgs) If e.Error IsNot Nothing Then ' An error was thrown by the DoWork event handler. MessageBox.Show(e.Error.Message, "An Error Occurred") Else Dim primes As Integer() = CType(e.Result, Integer()) For Each prime As Integer In primes lstPrimes.Items.Add(prime) Next End If cmdFind.IsEnabled = True cmdCancel.IsEnabled = False progressBar.Width = 0 End Sub

Beyond variable type and length, it is sometimes important to check the format of user-supplied values. Strictly speaking, an email address or date string is not a type of value. Both of these are of type string. But there is a particular format used by each of those examples, and it is important to validate against that format to ensure that your application runs smoothly and safely. From a security standpoint, formats tend to be most important when you pass values out of PHP to other applications, such as a database, or underlying systems like the filesystem or mail transport. Consequently, we reserve detailed discussion about validating these and other formats to the Sanitize Values section later. We mention this now, however, because we will be extending our simple input handler to do type, length, and format checking. Just remember that before you check the format of a value, you may first want to check its type, although the type will almost always be string in these cases.

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