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Update(this); else return (T)this; } public T Save(bool forceUpdate) { if (forceUpdate && IsNew) { // mark the object as old - which makes it // not dirty MarkOld(); // now mark the object as dirty so it can save MarkDirty(true); } return thisSave(); } The first Save() method is the primary one that does the real work It implements a set of common rules that make sense for most objects.

Figure 13.12 You can see what firewall rules are being enforced with select * from sys.firewall_rules.

Specifically, it does the following: Ensures that the object is not a child (since child objects must be saved as part of their parent) Makes sure that the object isn t currently being edited (a check primarily intended to assist with debugging) Checks to see if the object is valid; invalid objects can t be saved Checks to make sure the object is dirty; there s no sense saving unchanged data into the database Notice that the method is virtual, so if a business developer needs a different set of rules for an object, it is possible to override this method and implement something else The second Save() method exists to support Web Services (discussed in 10) It allows a web service author to create a new instance of the object, load it with data, and then force the object to do an update (rather than an insert) operation.

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The Service Bus is a cool piece of technology that allows you to message with applications that aren t necessarily running in the Azure data centers. If you have a custom, proprietary service that you need to continue to host, but you want to use Azure for all other aspects of your service offering, then the Service Bus is a good way to integrate with those services. The Service Bus is effectively an Enterprise Message Bus that s hosted in the cloud. We ll explore in more detail what this means and look at a couple of key scenarios where you could use this technology in chapter 17.

[NonSerialized()] private PropertyChangedEventHandler _nonSerializableHandlers; private PropertyChangedEventHandler _serializableHandlers; Notice that one is declared with the NonSerialized attribute, while the other is not The BinaryFormatter ignores the first one and all objects referenced by that delegate field Objects referenced by the second field are serialized as normal The event declaration uses a block structure, including add and remove sections Notice how the code in both sections checks to see if the event handler is contained within a serializable object if (valueMethodIsPublic && (valueMethodDeclaringTypeIsSerializable || valueMethodIsStatic)) If the event handler is contained in a serializable object, it will be added or removed from the serializable delegate; otherwise, it will be added or removed from the nonserialized delegate The thing about events and inheritance is that an event can only be raised by code in the class in which it is declared.

Summary

The reason for this is that when creating a web service to update data, the application calling the web service often passes all the data needed to update the database; there s no need to retrieve the existing data just to overwrite it This optional overload of Save() enables that scenario This is done by first calling MarkOld() to set IsNew to false, and then calling MarkDirty() to set IsDirty to true This feature can also be useful for some stateless Web Forms implementations as well..

This is because the event member can only be accessed directly from the class in which it is defined It can t be raised by code in classes that inherit from this class This means that business objects can t raise the PropertyChanged event directly, even though that is the goal To solve this problem, the code follows a standard NET design pattern by creating a protected method that in turn raises the event [EditorBrowsable(EditorBrowsableStateAdvanced)] protected virtual void OnPropertyChanged(string propertyName) { if (_nonSerializableHandlers != null) _nonSerializableHandlersInvoke(this, new PropertyChangedEventArgs(propertyName)); if (_serializableHandlers != null) _serializableHandlersInvoke(this, new PropertyChangedEventArgs(propertyName)); } Any classes that inherit from the base class can call this method when they want to raise the event This method is marked with the EditorBrowsable attribute, indicating that this is an advanced method.

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