Gets the previous value of the property as reported by a property changed event.
Assembly: PresentationFramework (in PresentationFramework.dll)
The value and type constraint of this property will be established by the RoutedPropertyChangedEventArgs<T> constructor's type arguments.
Windows 7, Windows Vista, Windows XP SP2, Windows Server 2008 R2, Windows Server 2008, Windows Server 2003
The .NET Framework and .NET Compact Framework do not support all versions of every platform. For a list of the supported versions, see .NET Framework System Requirements.