Page and control developers do not use the ControlSkinDelegate, ControlSkin, or PageTheme classes directly. These classes are used internally by the ASP.NET page framework to apply server-side properties and cascading style sheet definitions that are defined in ASP.NET themes and control skin files to specific types of controls.
ControlSkin objects represent a named skin or default skin of a Control control at run time and design time. ASP.NET builds PageTheme, ControlSkin and ControlSkinDelegate objects to apply the style elements defined in themes and control skin files to ASP.NET Web pages and controls.
The following code example demonstrates how control skins are specified for controls in a declarative ASP.NET page. The example shows three ASP.NET server controls found in the same page, two that use the same named skin and one that uses a different skin.