How to get the original value when update entity property? -

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When the entity / asset is updated / modified, I can put business logic in case of change in property : 

  partial zero OnMyPropertyChanged () {//.}

Handler in this event, I know the new value and original value for MyProperty I like. The new price can be obtained by it. Myprotie How to get the original price?

For example, if Oupet Myopportree is from 1 to 2, then the original value is 1, the new value is 2. this. MyProperty = 2. But how to get the original value 1?

The institutions in EF2 are also implementing INotifyPropertyChanging . I do not know that it is similar in EF4. You will be able to hear the property changing event and before that the property has changed.


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