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An HTML markup string that represents the control.
Use the ContainerControlDesigner.GetDesignTimeHtml(DesignerRegionCollection) method to get the HTML for the control. Child controls that are contained in the editable design region are rendered using their associated control designers.
The ContainerControlDesigner.GetDesignTimeHtml(DesignerRegionCollection) method initializes a new System.Web.UI.Design.EditableDesignerRegion object for the editable region of associated control, and then returns the region through the regions collection.