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The Data Access Application Block has gone through some retooling. In this version, more has been done to allow for improved consistency and ease of use. Here are a few important changes: You can utilize your application configuration file to store connection strings, or you can specify connection strings in your code. The API has been simplified to utilize the ADO.NET s DbCommand class, as opposed to the DbCommandWrapper class of prior versions. You can use the Data Access Application Block with any ADO .NET 2.0 data provider via the GenericDatabase class. The changes made to the Data Access Application Block helped simplify and improve efficiency when working with data storage providers. This application block is meant to handle a majority of your data access needs. Another way to put it is that you will probably find situations were it might be difficult and/or cumbersome to actually use the Data Access Application Block in a particular scenario. If you find yourself in this predicament, you will have to ask yourself three questions: Is this a one-off situation, or will this situation occur repeatedly during application development How much effort will it take to enhance the Data Access Application Block to accommodate your specific scenario Will the new features added actually improve productivity, efficiency, or performance Each application development environment will have different answers to the previous questions. Based on those answers, you will have a solid understanding of whether you really need to modify the application block or just code using the native features of ADO .NET 2.0 to handle your specific situation.

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The Caching Application Block has mostly gone through performance and design tweaks in Enterprise Library. Like its pre Enterprise Library predecessor, data can be persisted to a database or other storage mechanism to help survive application restarts. The Caching Application Block is also thread-safe, ensuring that the in-memory cache and the persisted data store stay synchronized. In addition, your multithreaded applications can call the cache without all the potential issues that can arise from calling a single object from multiple threads.

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The problem with this approach is that if the user selects the pause command from the menu, showNotify() will be called as soon as the menu goes away, starting the game again against the user s wishes! That s why I ve created two distinct functions in the Jump code in Listing 4-1: userPauseThreads() and systemPauseThreads() That way, the game proceeds only if the user wants it to proceed and the application management software verifies that the game isn t hidden..

When using the Caching Application Block, note that you should use it only if you need to persist data to some permanent data store; otherwise, the Patterns & Practices group recommends, and I agree, that you should use the built-in caching features found in the System.Web.Caching namespace. Hence, in .NET 2.0+, you can use the System.Web.Caching namespace outside ASP .NET 2.0.

the triggers is pressed, and stops when it is released. If the parameter continuous is false, the third function is activated only once per trigger press, and the motor rotates only if the variable old is different from function. Because old holds the preceding value of the function variable, this trick allows you to avoid the machine-gun effect. The third motor action is performed only once when a trigger is pressed, so to repeat that action, you must release the trigger and then press it again. This concludes the description of the simple version of the remote couple of programs. Next, you ll see how you can expand this basic program to feature multiple working modes.

Enterprise Library has introduced many new features into the world of exception management in the .NET environment. The pre Enterprise Library Exception Management Application Block essentially just logged an exception to a specific sink such as a database, a text file, or the Window s Application event log. This time the Patterns & Practices group has opted to shift the focus of the Exception Handling Application Block in Enterprise Library. Now this application block is focused more on the handling aspect via policies as opposed to simply logging them.

Figure 4-2. When the AMS displays the command menu, the game is paused. In addition to handling the situation where the platform has hidden the game canvas (either with a command menu or for some other reason), you also need to consider what happens when the device pauses the game because of an incoming call (or other interruption). In this case, the AMS will call pauseApp() to pause the game, and will call startApp() when the game resumes. Since this is the same startApp() method that is called when the application first starts, you need to write the code in such a way that it keeps track of whether the game is just starting or whether you re returning from a pause (see the implementation of startApp()

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