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else { Console.WriteLine("Configuration section not found"); } } } } After running the code in Listing 4-10, the configuration file should no longer contain the configuration section named MyCustomSection. You should note the following about how the FileConfigurationSource and SystemConfigurationSource classes behave when adding and removing configuration sections: The Add method will replace an existing configuration section if it has the same name as the one being added to it. Both the FileConfigurationSource and SystemConfigurationSource classes implement caching functionality. While the code in Listing 4-10 was saving the changes to the configuration file, the changes were also being pushed to cache. The FileConfigurationSource and SystemConfigurationSource classes can sense changes to their configuration data and will refresh their caches according. The FileConfigurationSource updates all the configuration sections when it senses a change; however, the SystemConfigurationSource class uses the .NET Framework s ConfigurationManager class to update the modified sections.

Figure 8-20. Soft platforms allow the cat to jump up onto them, but prevent it from falling through. Take a look at the SoftPlatform application class, and you ll see that platform tiles are added to the game world just like all the other tiles, using the buildMap method. The enterFrameHandler checks for collisions with soft platforms each frame by calling the collision controller s softPlatformCollision method. _collisionController.softPlatformCollision (_catModel, _platformMap, MAX_TILE_SIZE, SOFT_PLATFORM); The _collisionController has a Boolean variable called _softPlatformOpen, which is initialized to true when the game first starts. As soon as the cat jumps up through the platform, it sets it to false. This locks the platform and prevents the cat from falling through it. _softPlatformOpen is set back to true when the cat jumps off the platform. The code that does all this has a very interesting feature. It needs to know when the bottom of the cat has cleared the top of the platform so that the platform can be closed. It does this by checking what kind of tile the bottom of the cat occupied in the previous frame. The only reason for the previous tile being different from the current tile is that the cat has cleared the top of the platform. This check acts as a tripwire to close the platform. Because we re using Verlet integration, we already know what the cat s previous position was. It s stored in the cat s previousY property that it inherited from the AVerletModel class. And because we re using a tile-based engine, we

Enterprise Library contains a number of QuickStart sample applications to help developers get acquainted with some of the most commonly used features. One of these is actually a SQL Server implementation of IConfigurationSource. This implementation allows for the storage of configuration settings to be kept in a SQL Server database. In some environments, storing configuration data in a SQL Server database can prove useful. A few reasons are as follows: Changes can be made within a transaction. Configuration data could be normalized in some fashion and then rebuilt or disassembled within a stored procedure. Data can be fault-tolerant with the use of clustering and other failover technologies. Data can be replicated to other servers. Data can be securely stored. Configuration changes can be logged and archived easily. These are just a few reasons why an organization might want to use SQL Server as its configuration storage repository. Although a lot of these features can be implemented with minimal effort using the normal file system and operating system features of a server, some

To further illustrate the fundamental change of web applications, I will talk about my recent car buying experience To choose a car, I used the power of the Internet and some specific information sources that rated and compared cars I used Google to search the car makers for personal experiences and detailed information Having whittled down my choices to three car makers, I decided to hit the road and visit some dealers What happened shocked me All the car dealers rebuffed me because they could not do their half-hour shtick on why I should buy from them I peppered them with questions that surprised them It was disappointing, and I was saddened My wife said, You know, for the car you like, is there another dealer In fact, there was, and it turned out to be the region s biggest and central dealership.