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The form acts as a switchboard for all the controls it contains Always remember that the real goal of a switchboard is to route calls to a new destination In other words, when you create the event handler for a button s Click event, this event handler usually has two purposes: To forward the command to another object that can handle the task To update the display based on any feedback that s returned Depending on the button, only one of these tasks may be necessary But the important concept is that an event handler is almost always part of a user-interface class the form switchboard (After all, this is the design that Visual Studio uses) As a result, it s a terrible place to put business logic The form is meant to handle user-interface tasks and delegate morecomplicated operations to other classes.

That way, your interface won t become tightly bound to the rest of your application logic, and you ll be able to revise and enhance it at a later point without running into trouble Ideally, you should be able to remove a form, add a new one, or even combine forms without having to rewrite much code To accomplish this goal, forms should always hand off their work to another switchboard For example, it might be easy to update a record according to a user s selections by creating a new object in the form code and calling a single method However, if you add another layer of indirection by forcing the form to call a more generic update method in a central application switchboard, which then accesses your business objects, your user interface will become more independent and more manageable.

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Tip The performance for BINARY_FLOAT and BINARY_DOUBLE is higher than that of the conventional NUMBER data type. In a test script running one million iterations of an add operation between two BINARY_FLOAT values against the same operation for NUMBER values, I found that addition between BINARY_FLOAT variables was twice as fast as the ones between NUMBER variables.

Figure 1-12 shows how this process might work when updating a customer record The update is triggered in response to a control event The event handler calls a DoCustomerUpdate() switchboard method, which then calls the required methods in the CustomerDb business object This way, the form contains user-interface only code, the CustomerDb contains businessonly logic, and the application switchboard acts as an interface between the two..

causes Python to skip past the code block. (See Listing 2-1 for a few examples of logical expressions.) The important thing to remember with boolean logic is that there are no in-between values: you can t have 25 percent true and 75 percent false it s always one or the other! Listing 2-1. Simple Logic score = 100 health = 60 damage = 50 fugu = "tasty" print score != 100 print health - damage > 0 print fugu == "tasty" Running this simple script produces the following output: False True True Boolean values can be treated just like any other Python type, so you could have a variable that refers to a boolean. For example, if we were to add the line is_fugu_tasty = (fugu == "tasty"), then is_fugu_tasty would refer to the value True.

Tip Here s another way to look at Windows Forms design. Start by building a multilayered application object model that supplies all the features of your application. Then you can drive these features by calling methods on these objects. This way, you can make your calls from any event handler, whether it s in response to a menu command, a toolbar button click, or an automated testing tool that you ve developed to help you debug your code.

Statement caching is another Oracle Database 10g feature; with it, you can cache repeatedly used SQL statements. When you use statement caching, Oracle does not have to reparse your SQL statements, which means it can save time by not having to re-create the server objects every time it runs the same SQL. You can control statement caching behavior by changing the statement cache size via ODP.NET. For instance, specifying a statement cache size of 10 means that Oracle will attempt to cache ten SQL statements.

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