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A struct is a value type, and a class is a reference type. They can have radically different behavior when used in conjunction with inheritance. This behavior can lead to undesired side effects. Consider the following example, in which two types are defined with the same data member: struct ExStruct { public int value; } class ExClass { public int value; } The types ExStruct and ExClass define a public data member value. When the type ExStruct is manipulated and passed as a parameter to a method, the stack is used. In contrast, the type ExClass is a reference to some data in the heap. The easiest way to illustrate the difference is to pass an instance of each as a parameter to a method, as shown by the following code example: class ExMethodCall { public static void SecondMethod( ExStruct param1, ExClass param2) { DebugMgr.start( 10, "ExMethodCall.SecondMethod"); param1.value ++; param2.value ++; DebugMgr.output( 10, "During ExStruct.value = " + param1.value);

Accessibility and standards, whether you like it or not, are becoming increasingly important. Microsoft is aware of this and has introduced a number of changes.

can be any type of Path that you want. See Figure 15-14.

When writing user interface code, touch down and touch up events are especially useful. If you remember which user interface element was touched (down event), you can test for the same element when released (up event). If they are the same, you activate the action. This is how you make a button that users can touch, while giving them the option of dragging their finger off the button to not activate it. Most standard buttons on Mac OS X and Windows systems work this way.

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This chapter has walked through the various types and classes in the framework that enable both mobile objects and data access. The details of mobile objects are managed by a concept called the data portal. You should understand that the data portal incorporates several areas of functionality: Channel adapter Distributed transactional support Message router Context and location transparency The channel adapter provides for flexibility in terms of how (or if ) the client communicates with an application server to run server-side code. The distributed transactional support abstracts the use of Enterprise Services or System.Transactions. The message router handles the routing of client calls to your business components on the server, minimizing the coupling between client and server by enabling a single point of entry to the server. Behind the scenes, the data portal provides transparent context flow from the client to the server and back to the client. This includes implementing impersonation when using custom authentication. The base classes from 3 were updated to integrate with the data portal concept and to support data access. Mostly, this revolves around the five DataPortal_XYZ methods: DataPortal_Create() DataPortal_Fetch() DataPortal_Update() DataPortal_Execute() DataPortal_Delete() 3 walked through the support for editable and read-only business objects. 4 has now added on mobile object and data access concepts. 5 will complete the framework by discussing custom authentication and by covering a set of broadly useful base classes and objects that simplify the creation of business applications.

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