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Tip Another option is to use the System.WeakReference class to wrap the bitmap, which allows the bitmap to be garbage-collected if system resources become scarce. It s fairly easy to wrap another object with a WeakReference instance just pass the object as an argument in the constructor. You can retrieve or set the wrapped object at any time through the WeakReference.Target property, but before you try to access it check WeakReference.IsAlive to make sure it wasn t garbage-collected because of memory pressure,

Note You will need to be logged in to the server as a user with the SUPER privilege in order to change the

In previous versions, ODP.NET supports the configuration of its settings via either the connection string or through the ODP.NET classes. With version 10 of ODP.NET, developers can additionally configure ODP.NET settings via .NET configuration files such as the web.config and machine.config files. With so many different ways to configure ODP.NET settings, Figure 2-3 shows how this affects settings precedence.

If you are creating an application that has dozens of identical buttons, you may be able to use a different technique to cut down on the memory usage. For example, if you have relatively large OK and Cancel buttons that you use on forms throughout your application, it makes little

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Next, execute a new INSERT statement in an explicit transaction in Connection 1: mysql> START TRANSACTION; mysql> INSERT INTO numbers VALUES (7); mysql> SELECT * FROM numbers; +-----------+ | my_number | +-----------+ | 1 | | 2 | | 3 | | 4 | | 5 | | 6 | | 7 | +-----------+ 7 rows in set (0.00 sec) You can see the new row in Connection 1. Now switch to Connection 2 and exit, since the new isolation level will be available only for new sessions. Open a new session and issue the same SELECT statement: mysql> SELECT * FROM numbers; +-----------+ | my_number | +-----------+ | 1 | | 2 | | 3 | | 4 | | 5 | | 6 | | 7 | +-----------+ 7 rows in set (0.00 sec)

Figure 2-3. ODP.NET configuration settings precedence As you can see from Figure 2-3, you can configure ODP.NET at four different levels, and the precedence is such that settings configured at the connection level overrides settings configured at the web.config level, and so on. Some of the settings that can be configured include the FetchSize (covered earlier), maximum statement cache size, thread pool maximum size, and so on. The next chapter will cover more of these settings in detail. The ability to configure settings at many levels allows an application to fall back to a set of default settings when none are specified. For instance, a server in an organization might need to satisfy an organization s internal quality of service benchmark by having its maximum statement cache size set to a value of 100 at the machine level. If you forget to explicitly set this maximum statement cache size in the connection string, the statement cache size used will still fall back to the machine-level setting of 100.

sense to cache each instance of the button separately Instead, you should cache one copy in memory, and use it for every button There are several possibilities for implementing this design All of them rely on static members First of all, you should start with a class that encapsulates the details you want to cache, as shown here: public class AnimatedButtonCachedImages { private Image normalImage; private Image mouseOverImage; private Image pushedImage; private Image disabledImage; // (Public properties omitted) } Then you could create a class that caches a group of these objects Here s how you could keep a collection of AnimatedButtonCachedImages, indexed by name and available to your entire application: public static Dictionary<string, AnimatedButtonCachedImages> CachedImages; Now you can add a StyleName property to the AnimatedButtonBase class, and rewrite the code in CreateAndPaintCachedImage().

As you can see, the READ UNCOMMITED isolation level weakened the protection against the new data, allowing the new connection to see the result of an as-of-yet-uncommitted transaction in Connection 1 Let s go ahead and ROLLBACK our transaction in Connection 1, causing the INSERT to be undone: mysql> ROLLBACK; Query OK, 0 rows affected (008 sec) mysql> SELECT * FROM numbers; +-----------+ | my_number | +-----------+ | 1 | | 2 | | 3 | | 4 | | 5 | | 6 | +-----------+ 6 rows in set (000 sec) As you can see, our new record is gone in Connection 1 Let s check Connection 2: mysql> SELECT * FROM numbers; +-----------+ | my_number | +-----------+ | 1 | | 2 | | 3 | | 4 | | 5 | | 6 | +-----------+ 6 rows in set (0.

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