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Each event is declared in CslaDataSource, along with a method to raise that event. For instance, here s the SelectObject event and related method: Public Event SelectObject As EventHandler(Of SelectObjectArgs) Friend Sub OnSelectObject(ByVal e As SelectObjectArgs) RaiseEvent SelectObject(Me, e) End Sub EventHandler(Of T) is a generic template in the .NET Framework that simplifies the declaration of event handler type events. Notice that the OnSelectObject() method is Friend in scope. It will only be called by CslaDataSourceView, and shouldn t be visible to UI or business developers.

The BusinessBase and BusinessListBase classes provide the tools needed to build editable objects and collections. However, most applications also include a number of read-only objects and collections. An application might have a read-only object that contains system configuration data, or a read-only collection of ProductType objects that are used just for lookup purposes. The ReadOnlyBase class provides a base on which business developers can build read-only root and child objects. By definition, a read-only object is quite simple: it s just a container for data, possibly with authorization or formatting logic to control how that data is accessed. It doesn t support editing of the data, so there s no need for n-level undo, change events, or much of the other complexity built into BusinessBase. ReadOnlyBase supports read-only properties, authorization, and persistence. Like all base classes, this one is Serializable and abstract. It also implements Csla.Core. IBusinessObject to provide some level of polymorphic behavior even though this is a generic class: [Serializable] public abstract class ReadOnlyBase<T> : Core.MobileObject, ICloneable, Core.IReadOnlyObject, Csla.Security.IAuthorizeReadWrite, Server.IDataPortalTarget, Core.IManageProperties where T : ReadOnlyBase<T> Like BusinessBase, the generic type T is constrained to be the type of business object being created, so a business class is declared like this: [Serializable] public class DefaultCustomerData : ReadOnlyBase<DefaultCustomerData> { } Presumably, any business object based on this class would consist entirely of read-only properties or methods that just return values. ReadOnlyBase supports data binding, authorization, and persistence. Figure 6-10 illustrates the inheritance hierarchy for ReadOnlyBase.

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website, http://msdn.microsoft.com/en-us/library/cc838238(VS.96).aspx. To get more details on how to localize information about an out-of-browser application, refer to the Microsoft MSDN website, http://msdn.microsoft.com/en-us/library/dd772170(VS.96).aspx.

Once everything was documented for Snow Reports, I needed to make sure that I had a signed data usage agreement from OnTheSnow.com. I can only imagine the state of insanity that would occur if I were halfway through development only to find that the folks at OnTheSnow.com had changed their minds before signing. Likewise, I recommend that you identify and acquire your third-party resources up front. Do you need data for your application You will need to find a data provider, contact that company, and negotiate to gain access to its data. Do you need to purchase or have sound effects created Do you need to purchase any stock icons or graphics List all of these requirements, especially if they have costs attached to them. Three sound effects might be cheap, but if you need fifty of them for a game, the costs can quickly add up. It s no use worrying over the development of an application if you can t get the data or the media it needs to function.

Another Generic Delegate Example . ....................................................................................................490

The #if and #endif directives are the matching demarcations of a conditional compilation construct. Whenever there is an #if directive, there must also be a matching #endif. Figure 23-1 illustrates the #if and #if...#else constructs. If the condition in the #if construct evaluates to true, the code section following it is compiled. Otherwise, it is skipped. In the #if...#else construct, if the condition evaluates to true, CodeSection1 is compiled. Otherwise, CodeSection2 is compiled.

The StopWatch class works by reading the value of a system counter. If your operating system and hardware support a high-resolution counter, the StopWatch class will use this automatically. If not, the standard system counter will be used instead. These counters don t measure absolute time; they start at zero when the system starts and are incremented several thousand times per second. To measure

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