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Then call the appropriate Execute method on the command. When all commands complete, use the transaction s Commit method to make the changes permanent.

OLE Data Provider, and the SQL Provider implements pooling directly in the .NET classes; consult the .NET documentation for details of the pooling strategy. Table 16-4 summarizes the connection string parameters that can be used to specify the default connection pooling behavior of the SqlConnection class.

FIGURE 9-14 Using Microsoft Office Live Meeting to present the Point A slide with text boxes added.

and use a regular expression to split the string into words. Then create a new string that lists each word, one to a line, each prefaced with a line number.

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Contact List This isn t well-de ned if any of the authors has more than one phone number because it doesn t specify how we choose phone numbers for the list. Shortest Book Although the minimum number of pages is well-de ned (assuming a standard procedure for counting pages), more than one book might have the minimum number of pages. As a result, we can t be sure there is a single shortest book. Square We don t know the value of x, so x2 isn t a well-de ned number. On the other hand, it is a well-de ned algebraic expression. Letter This de nes a particular letter of the English alphabet but not a speci c example of that letter in, say, a copy of this book. These simple examples offer a number of lessons, but I ll mention just one in particular: English can easily mislead. For example, two words that indicate uniqueness the de nite article the and the superlative shortest were used to describe something that wasn t in fact unique. Later in this chapter, I ll be more speci c about the notion of well-de nedness as it applies to sets.

[October, 31]

does refer to other objects You have no control over when the Finalize method will execute The object might hold on to resources until the next time the garbage collector runs The CLR doesn t make any guarantees as to the order in which Finalize methods are called For example, let s say an object contains a pointer to another object, which I ll call the inner object The garbage collector has detected that both objects are garbage Let s further say that the inner object s Finalize method gets called first Now, the outer object s Finalize method is allowed to access the inner object and call methods on it, but the inner object has been finalized and the results can be unpredictable For this reason, Microsoft strongly recommends that Finalize methods do not access any inner, member objects.

charType = charTypeTable[ inputChar ];

In lines 3 4, a Dictionary is declared, mapping strings to flyweights. On lines 13 14, the Dictionary is accessed using the indexer that is part of the Dictionary definition. Line 13 is an example of the use of the set accessor, and line 14 calls a get accessor. This is all part of the member declared in lines 10 16, where we define our own indexer for the FlyweightFactory class. Line 10 specifies the return type and the key type, and lines 12 14 give the body of the get accessor. It starts by checking whether there is already a Flyweight with this key. If not, it allocates one. In either case, it returns the element in the dictionary with the correct index.

The dispose pattern, which I ll cover later in this chapter, offers a way to clean up an object where this restriction doesn t apply If you determine that your type must implement a Finalize method, then make sure that the code executes as quickly as possible Avoid all actions that would block the Finalize method, including any thread synchronization operations Also, if you let any exceptions escape the Finalize method, the CLR swallows the exception and continues calling other objects Finalize methods NoteBy far, the most common reason to implement a Finalize method is to free an unmanaged resource that the object itself owns In fact, during finalization, you should avoid writing code that accesses other managed objects or managed static methods.

Example 3-1 initializes the variable myInt to the value 7, displays that value, reassigns the variable with the value 5, and displays it again.

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