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// This event fires when a property is being changed.

event PropertyChangedEventHandler PropertyChanging;

}

}

namespace System.ComponentModel

{

public interface INotifyPropertyChanged

{

// This event fires when a property value has changed.

event PropertyChangedEventHandler PropertyChanged;

}

}

Collectively, these interfaces define a total of two events named PropertyChanging and

PropertyChanged, both of which work in conjunction with the PropertyChangedEventHandler dele-

gate defined in the System.ComponentModel namespace. This delegate can call any method taking an

object as the first parameter and a PropertyChangedEventArgs as the second. Given the interface

contract, each entity class supports the following members:

[Table(Name="Inventory")]

public partial class Inventory : INotifyPropertyChanging, INotifyPropertyChanged

{

public event PropertyChangedEventHandler PropertyChanging;

public event PropertyChangedEventHandler PropertyChanged;

...

}

If you were to examine the implementation of the properties of any of the three entity classes,

you will note that the set scope fires each event to any interested listener. By way of an example,

here is the PetName property of the Inventory type:

[Column(Storage="_PetName", DbType="VarChar(50)")]

public string PetName

{

get

{

return this._PetName;

}

set

{

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