System.Design 2.0.0.0 To be added. Provides an interface for access to a master page from a content page at design time, if provided by a design host, such as vsprvslong.  Property 2.0.0.0 System.Collections.IDictionary To be added. To be added. Gets the objects for the content placeholders that are identified in the master page. Method 2.0.0.0 System.Web.UI.Design.ContentDesignerState To be added. Retrieves the current state of the identified content place holder. The current state of the identified content placeholder. The identifier for a content place holder. Method 2.0.0.0 System.Void To be added. Sets the current state of the identified content place holder. The identifier for a content place holder. A .