System.Design 2.0.0.0 System.Enum To be added. Enumerates the possible settings for the state of a control at design time. Field 2.0.0.0 System.Web.UI.Design.ContentDesignerState The associated control displays the default content. Field 2.0.0.0 System.Web.UI.Design.ContentDesignerState The associated control displays the user content.