System.Windows.Forms 2.0.0.0 System.Enum To be added. Provides options that specify the relationship between the control and preprocessing messages. Field System.Windows.Forms.PreProcessControlState Specifies that the control requires the message and that processing should continue. 2.0.0.0 Field System.Windows.Forms.PreProcessControlState Specifies that the control does not require the message. 2.0.0.0 Field System.Windows.Forms.PreProcessControlState Specifies that the message has been processed and no further processing is required. 2.0.0.0