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[Transaction(TransactionOption.Required)] public class CustomerService { public void IncreaseCreditLimit( int customerNum, double increaseAmount) { try { Customer cust = new Customer(customerNum); double max = cust.MaxAllowableCredit; double current = cust.CreditLimit; if (max < current + increaseAmount) { ContextUtil.MyTransactionVote = TransactionVote.Abort; } else { cust.CreditLimit += increaseAmount; cust.Save(); ContextUtil.MyTransactionVote = TransactionVote.Commit; } } catch (Exception ex) { ContextUtil.MyTransactionVote = TransactionVote.Abort; throw new Exception( "Attempt to increase limit failed", ex); } } } It s only necessary to use this option when you do not want to throw exceptions when a component is unable to finish its work. Generally, unless it interferes with a larger errorhandling strategy, you should use the AutoComplete attribute, as this results in much cleaner code overall. Transactions are managed under the hood of COM+ by the Distributed Transaction Coordinator, a separate Windows Service. This service must be running for COM+ transactions to work. It is an expensive resource, and you must make considerations for the overhead your application will incur when you decide to use it. MSDTC is not the only technology available to manage transactions; you should consider other less-expensive options before deciding to go into COM+. A few bars for entry into COM+ for transactional management exist.

Figure 4-16. Webcam/Mic tab within the Silverlight configuration dialog box to display and change the selection of the captured audio and video devices Key properties of the CaptureDevice class are shown in Table 4-15. Table 4-15. Key Properties of the CaptureDevice Class

When you set a property of an object in ASP.NET such as Width on a TextBox, you would usually write something like this: <asp:TextBox Width= 300" Runat="server" /> Behind the scenes, the Width value is retained in a private field. If you were to retrieve the Width property, it would be the same as when it was first set. However, when working with dependency properties, this is not necessarily true.

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Not only do applications sometimes need read-only business objects, but they also commonly require immutable collections of objects. The ReadOnlyListBase class lets you create strongly typed collections of objects whereby the object and collection are both read-only. <Serializable()> _ Public Class StaticList Inherits ReadOnlyListBase(Of StaticList, ChildType) End Class As with ReadOnlyBase, this object supports only the retrieval of data. It has no provision for updating data or handling changes to its data. While the child objects in such a collection may inherit from ReadOnlyBase, they don t have to. More commonly, the child objects in a read-only collection are just simple .NET objects that merely expose read-only properties.

Cancellation tokens are a struct that provide a consistent means of cancellation. You might want to use a cancellation token to cancel a function or task that is taking too long or using too much of a machine s resources. Support is provided in many of the Task and PLINQ methods for the use of cancellation tokens. To use cancellation tokens, you first need to create a CancellationTokenSource. Then you can utilize it to pass a cancellation token into the target method by using the Token property. Within your method, you can then check the token s IsCancellationRequested property and throw an operation cancelled exception if you find this to be true (e.g. a cancellation has occurred). When you want to perform a cancellation, you simply need to call the Cancel() method on the cancellation source that will then set the token s IsCancellationRequested() method to true. This sounds more complex than it actually is; the following example demonstrates this process: static CancellationTokenSource cts = new CancellationTokenSource(); static void Main(string[] args) { Task t = Task.Factory.StartNew(() => DoSomething(), cts.Token); System.Threading.Thread.Sleep(2000); cts.Cancel(); Console.ReadKey(); } public static void DoSomething() { try { while (true) { Console.WriteLine("doing stuff");

By default, the XAP package is created in the ClientBin directory as the <your Project name>.xap file. If you set the Resource option, it gets embedded into the project DLL. In this case it will not be straightforward to access the resource file. You can retrieve the resource file by decompiling the DLL file using third party tools. There is no need for a leading slash (/) before the URI for example, <Image Source="tologo.png" />. This same image can be set from the code-behind by using a relative URI: Image img = new Image(); img.Source = new BitmapImage(new Uri("tologo.png", UriKind.Relative));

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