System 1.0.5000.0 2.0.0.0 4.0.0.0 System.EventArgs A event occurs when a change to a user preference is about to be applied. Provides data for the event. Constructor 1.0.5000.0 2.0.0.0 4.0.0.0 To be added. Initializes a new instance of the class using the specified user preference category identifier. One of the values that indicate the user preference category that is changing. Property 1.0.5000.0 2.0.0.0 4.0.0.0 Microsoft.Win32.UserPreferenceCategory To be added. To be added. Gets the category of user preferences that is changing.