The Control.ApplyStyleSheetSkin(Page) method sets style properties on the control based on skin properties defined in a theme directory. The skin applied is either the default skin for the control or the skin specified in the Control.SkinID property. The Control.ApplyStyleSheetSkin(Page) method is called by ASP.NET for declarative controls placed on a page. You must call the Control.ApplyStyleSheetSkin(Page) method on any controls created programmatically at run time for style sheet skins to apply to the control. Theme skins are applied automatically. For more information on the difference between themes and cascading style sheets, see ASP.NET Themes Overview.