This print for content only-size & color not accurate 7" X 9-1/4" / casebound / malloy

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8849CH24.qxd  10/19/07  10:11 AM  Page 850

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if ((this._PetName != value))

{

this.OnPetNameChanging(value);

this.SendPropertyChanging();

this._PetName = value;

this.SendPropertyChanged("PetName");

this.OnPetNameChanged();

}

}

}

Notice that the set scope invokes the OnPetNameChanging() and OnPetNameChanged() methods

on the entity class type to actually fire the events themselves. However, these members are defined

as 

partial methods, which you may recall from Chapter 13 perform a type of lightweight event han-

dling, allowing interested callers to provide an implementation if they so choose (if not, they are

removed from the type definition at compile time):

partial void OnPetNameChanging(string value);

partial void OnPetNameChanged();