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On the server, the method took only a single parameter. On the client, it takes that same parameter, plus a callback and a data item. In this case, the data item is the Employee you re working with. You use that because you need access to the Employee inside the callback method. The callback method executes when the asynchronous call has completed. The single parameter for the callback is an InvokeOperation object with a number of properties, including the UserState and error information. In this method, you check for an error. If there s no error, you cast the UserState back to an Employee object, check it for null, and then use the function return value (the calculated bonus) and add that to the existing vacation hours. That object is then marked as HasChanges = true on the entity. The entity is then eligible for the SubmitChanges call.

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its content, cable and telephone companies who want to control its delivery, and a powerful market that wants it to be ubiquitous, richly featured, and cheap Regulators are in the mix as well, trying to make sense of a telecommunications industry that, once designed to transport voice, now carries a broad mix of fundamentally indistinguishable data types

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Referring back to table 17.6, you ll notice that no Insert, Update, or Delete methods were generated. Instead, those are called via SubmitChanges. SubmitChanges is an asynchronous batching operation. It handles sending all method calls to the server, with the exception of Invoke and Query operations. When you insert new items or delete existing items, those operations occur only on the client. When you call SubmitChanges, it loops through the entities on the client and sends to the server those entities that require a persistence operation, calling the appropriate operation for each entity. To cancel all pending changes for the domain context, call the RejectChanges method. It reverts entities back to their previous state, removes any newly inserted items, and reinstates any deleted items. The domain context is the client-side proxy for the domain service, as well as the container within which all instances of a given entity reside. It provides an interface for invoke operations and query operations, as well as an implicit interface to the insert, update, and delete operations through the SubmitChanges method. The entity classes Employee and Contact both inherit from a common client-side base class that provides much of the required change-tracking and other plumbing functionality. This class is named, appropriately enough, Entity.

The Wizard next prompts you to configure the SELECT statement. The SELECT statement is the SQL code the control uses to retrieve the exact subset of data you are looking for from the database. Fortunately, if you are not fluent in SQL (most often pronounced see-quill ), the Wizard will help you build the statement.

Summary

Each client-side entity you work with, Employee and Contact in this example, derives from the Entity base class. This class provides a number of important change-tracking properties and methods. Table 17.7 shows the most important public members of the Entity base class Your derivations of the Entity class (the Contact class and the Employee class) also include all the individual properties that correspond to the fields coming from the database. Because this code was generated by the tools and not shared with the server, the properties have INotifyPropertyChanged and several other events injected into them. In this way, your otherwise-plain classes on the server can support binding and

Premises technologies including LANs, wireless solutions, and the content that rides on both of them are the most visible components of the overall network to a customer In the next chapter we dive into the network itself and explore the access technologies that provide the bridge between premises technologies and the transport network

The data state of this entity: Detached, Unmodified, Modified, New, or Deleted Indicates that this entity has changed since the last time it was saved Indicates that this entity has failed validation Returns a collection of validation errors Returns an instance of the unchanged entity from cache

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