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some type of interactive wizard or application help, as they can direct the user to an important control or part of the screen.

Figure 2-2. Flight Information Display Application Example There are many other interesting ways to utilize change notifications. You could use them to create audit logs when data is changed or to send out e-mail alerts when specific changes are detected. ODP.NET allows you to tap on the power of this functionality from .NET code.

Controls also provide some built-in intelligence for dealing with the keyboard and mouse. These include low-level events that react to key presses and mouse movement, and methods that return key and mouse button state information. The next few sections describe all of these key ingredients.

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Huffman trees work by analyzing a data set, or even a single piece of data, and determining at what frequency pieces of the data occur within the data set For instance, in a typical group of English words, we know that certain letters appear with much more frequency than other letters Vowels occur more frequently than consonants, and within vowels and consonants, certain letters occur more frequently than others A Huffman tree is a representation of the frequency of each piece of data in a data set A Huffman encoding function is then used to translate the tree into a compression algorithm, which strips down the data to a compressed format for storage A decoding function allows data to be uncompressed when analyzed.

Table 2-4 lists the events a typical control fires if it has focus when the user presses a key. These controls unfold in this order: KeyDown KeyPress KeyUp Generally you will react to the KeyDown and KeyUp events when you need to react to special characters like the arrow keys, which do not trigger KeyPress events. The KeyPress event is used when you need to restrict input and perform character validation.

For example, let s say we had some string data like the following: "EALKNLEKAKEALEALELKEAEALKEAAEE" The total size of the string data, assuming an ASCII (single-byte, or technically, 7-bit) character set, would be 30 bytes If we take a look at the actual string characters, we see that of the 30 total characters, there are only 5 distinct characters, with certain characters occurring more frequently than others, as follows:.

Connection pooling allows Oracle connections to be retrieved from a cached pool of connections and to be returned to this pool after use. Connection pooling leads to a reduced overhead when opening connections. When your application opens a connection to Oracle for the first time, it is a relatively costly operation in terms of performance. In web applications, for instance, where each page request opens a new connection, this could lead to a significant impact on performance. Connection pooling addresses this cost by keeping these connections cached in the pool and reusing them the next time your application attempts to open a new connection with the same settings. Connection pool behavior can be modified by specifying certain settings (such as the minimum and maximum size of the pool or whether pooling is disabled or enabled) in the connection string used to connect to the database. ODP.NET takes this a step further by allowing you to explicitly clear the connection pool of connections using these two functions: ClearPool: Clears all connections from a connection pool ClearAllPools: Clears all connections from all connection pools in an application domain There are times when a connection pool can become corrupt due to, for instance, the database service restarting from a power outage or from other reasons. Your application would receive an exception when it attempts to connect to the database. These two functions come in handy during such scenarios, allowing you to clear the connection pool and reconnect again.

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