System 2.0.0.0 4.0.0.0 System.Enum System.Runtime.InteropServices.ComVisible(true) To be added. Specifies the start or end of a code region. Field 2.0.0.0 4.0.0.0 System.CodeDom.CodeRegionMode End of the region. Field 2.0.0.0 4.0.0.0 System.CodeDom.CodeRegionMode Not used. Field 2.0.0.0 4.0.0.0 System.CodeDom.CodeRegionMode Start of the region.