gtk-sharp 0.0.0.0 Gtk# is thread aware, but not thread safe; See the Gtk# Thread Programming for details. Event handler. The event utilizes this delegate: Event data is passed via the parameter. To attach a to an event, add the MotionNotifyEventHandler instance to the event. The methods referenced by the MotionNotifyEventHandler instance are invoked whenever the event is raised, until the MotionNotifyEventHandler is removed from the event. System.Delegate System.ICloneable System.Runtime.Serialization.ISerializable System.Void