Raised when the participation state has changed.
Assembly: Microsoft.Lync.Model (in Microsoft.Lync.Model.dll)
The participation state change event is raised multiple times when a participant attempts to take a control action on a shared resource. For example, if a user requests control of a shared resource and the control request is granted, the event is rased when the ParticipationState goes from Viewing to RequestingControl. When the request is granted, the event is raised again when the ParticipationState changes to Controlling.