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Although it might not seem like it from the onset, the process of atomically altering a single value is quite common in a multithreaded environment. Assume you have a method named AddOne() that increments an integer member variable named intVal. Rather than writing synchronization code such as the following: Public Sub AddOne() SyncLock Me initVal = intVal + 1 End SyncLock End Sub you can simplify your code via the shared Interlocked.Increment() method. Simply pass in the variable to increment by reference. Do note that the Increment() method not only adjusts the value of the incoming parameter, but also returns the new value: Public Sub AddOne() Dim newVal As Integer = Interlocked.Increment(ntVal) End Sub In addition to Increment() and Decrement(), the Interlocked type allows you to atomically assign numerical and object data. For example, if you wish to assign a member variable to the value 83, you can avoid the need to use an explicit SyncLock statement (or explicit Monitor logic) and make use of the Interlocked.Exchange() method: Public Sub SafeAssignment() Interlocked.Exchange(myInt, 83) End Sub Finally, if you wish to test two values for equality to change the point of comparison in a threadsafe manner, you are able to leverage the Interlocked.CompareExchange() method as follows: Public Sub CompareAndExchange() ' If the value of myInt is currently 83, change i to 99. Interlocked.CompareExchange(myInt, 99, 83) End Sub

From a development standpoint, there are many advantages to creating a universal application, but is it the right choice for you If your app is free, then your goal is to provide the most convenient, user-friendly access to it A universal application makes it easy for users to download your app across all of their Apple mobile devices But paid apps are a different story Putting aside the technical benefits for a moment, let s look at the business factors involved If your iPad app represents an enhanced edition, offering dozens of exclusive new features that are not available in your iPhone version, it may make more sense to release it as a separate, stand-alone iPad app As a universal application, existing owners of your iPhone app will be able to access the iPad version for free, since there s no official upgrade mechanism supported in universal applications.

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The final synchronization primitive examined here is the <Synchronization> attribute, which is a member of the System.Runtime.Remoting.Contexts namespace. In essence, this class-level attribute effectively locks down all instance member code of the object for thread safety. When the CLR allocates objects attributed with <Synchronization>, it will place the object within a synchronized context. As you may recall from 15, objects that should not be removed from a contextual boundary should derive from ContextBoundObject. Therefore, if you wish to make the Printer class type thread-safe (without explicitly writing thread-safe code within the class members), you could update the definition like so: Imports System.Runtime.Remoting.Contexts ... ' All methods of Printer are now thread-safe! <Synchronization> _ Public Class Printer Inherits ContextBoundObject Public Sub PrintNumbers() ... End Sub End Class

Console.WriteLine(" Logging Trade to database: {0}", recordText); conn.Close(); } } else Console.WriteLine(" } } Next you can modify the App.config file for the service host in order to ensure that all transactions are passed on to the QuickReturns Ltd. trade service. The console-based service host does not require any modifications, since the host service itself does not change. You will be calculating the trade value and returning this to the client, as well as logging the trade into the TradeService database. This is a simple database with a log table, which has an identity field and the log field. Both the transactions are occurring within a transaction scope and will fail or succeed as a single unit, as shown in Listing 9-10. Listing 9-10. Modifying the Host App.config File < xml version="1.0" encoding="utf-8" > <configuration> <appSettings> <!-- Sets connect to a database --> <add key="usingSql" value="true" /> <!-- Sets the database connection string --> <add key="connectionString" value="DataSource=.\SQLEXPRESS; AttachDbFilename= |DataDirectory|\TradeServiceDb.mdf;Integrated Security= True;User Instance=True" /> </appSettings> Now that you have established the database connectivity for the logging, you can modify the <Service> attributes. In Listing 9-11, you will be configuring the bindings of the service to use the WS-Atomic transaction protocol. Listing 9-11. Setting the WSAtomicTransaction Binding Configuration in App.config <system.serviceModel> <services> <service name="QuickReturns.TradeService" behaviorConfiguration="TradeServiceBehavior"> Noting row: {0}", recordText);

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