Note
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You can insert custom functionality to respond to changes in the model in the following ways:
- Events 
- Rules 
- Overridable class methods 
You are notified of changes to the model, and your custom code can run when those changes occur.
Overriding Class Methods
You can override several class methods in a derived class or partial class. These methods always begin with On. For example: DomainPropertyValueHandler.OnValueChanging.
See Also
Tasks
How to: Register to be Notified on an Event