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and expect it to work without a trigger (unlike other controls). If you don t use a trigger, the timer will force a full postback, with flicker.

covered in this book, and they aren t required to build ASP.NET applications. For more information about these language features, consult a more detailed book that covers the Visual Basic language, like Andrew Troelsen s Pro VB 9.0 and the .NET 3.5 Framework, Third Edition (Apress, 2007).

Cake uses naming conventions to simplify building an application. By adhering to the convention over configuration paradigm, Cake provides you not only with dozens of useful functions and code-cutting methods but also with an overall method for organizing the resources the application will use. How to name models, views, and controllers, as well as several other Cake resources such as helpers, elements, and components, is an essential aspect of learning Cake. Not only will you need to structure your application following Cake s conventions, but how you design the database also matters for taking advantage of the framework. Database normalization is key to designing a schema that best fits Cake s conventions and is essential for working with the models correctly. When you use the various relationships in your database (one-to-one, one-to-many, and many-to-many), Cake is able to do much of the difficult work in mapping the data and making them available in the application.

The beginning of this chapter introduced the idea of shared properties and methods, which can be used without a live object. Shared members are often used to provide helper functionality (such as conversion routines, validation tests, or miscellaneous pieces of information) that you ll want to access without being forced to create an object. The .NET class library uses shared members heavily (as with the System.Math class explored in the previous chapter). Shared members have a wide variety of possible uses. Sometimes they provide basic conversions and utility functions that support a class. To create a shared property or method, you just need to use the Shared keyword right after the accessibility keyword. The following example shows a TaxableProduct class that contains a shared TaxRate property and private variable. This means there is one copy of the tax rate information, and it applies to all TaxableProduct objects. Public Class TaxableProduct Inherits Product ' (Other class code omitted for clarity.) Private Shared _taxRate As Decimal = 1.15D ' TaxRate is shared, which means that you can call ' TaxableProduct.TaxRate, even without an object. Public Shared Property TaxRate() As Decimal Get Return _taxRate End Get Set(value As Decimal) _taxRate = value End Set End Property End Class You can now get or set the tax rate information directly from the class, without needing to create an object first: ' Change the TaxRate. This will affect all TotalPrice calculations for any ' TaxableProduct object. TaxableProduct.TaxRate = 1.24D

Shared data isn t tied to the lifetime of an object. In fact, it s available throughout the life of the entire application. This means shared members are the closest thing .NET programmers have to global data. A shared member can t access an instance member. To access a nonshared member, it needs an actual instance of your object.

The data for this set of exercises is on the Ridge Running Exercises.xls workbook s Finish Times worksheet, as shown in Figure 5-15.

Object variables can be converted with the same syntax that s used for simple data types This process is called casting When you perform casting, you don t actually change anything about an object in fact, it remains the exact same blob of binary data floating somewhere in memory What you change is the variable that points to the object in other words, the way your code sees the object This is important, because the way your code sees an object determines what you can do with that object An object variable can be cast into one of three things: itself, an interface that it supports, or a base class from which it inherits You can t cast an object variable into a string or an integer Instead, you need to call a conversion method, if it s available, such as ToString() or Parse().