Occurs when a property value changes.
'Usage Dim instance As INotifyPropertyChanged Dim handler As PropertyChangedEventHandler AddHandler instance.PropertyChanged, handler 'Declaration Event PropertyChanged As PropertyChangedEventHandler
The PropertyChanged event can indicate that all properties on the object have changed by using either nullNothingnullptra null reference (Nothing in Visual Basic) or String..::.Empty for the PropertyName property of the PropertyChangedEventArgs.
In data binding, raise PropertyChanged on the data source to cause updates to propagate to the target.
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