The MultiView control is a container for a group of View controls. An application renders a specific View control to the client browser based on criteria that the application defines.
In a visual designer, when you switch from Source to Design view, the markup source code that describes the MultiView control is parsed and a design-time version of the control is created on the design surface. When you switch back to Source view, the design-time control is persisted to the markup source code and edited into the markup for the Web page. The MultiViewDesigner class provides design-time support for the MultiView control in a visual designer.