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Use the Style.RegisteredCssClass property to retrieve the CSS class that is registered with the control.
A style is registered on the current page with a System.Web.UI.IStyleSheet.RegisterStyle(Style, System.Web.UI.IUrlResolutionService) method, which looks for a <head runat="server" > element on the page where the properties in the current instance are placed in an embedded style sheet, represented by a <style> element, under a class name unique to the associated control.