public virtual void ApplyStyleSheetSkin(Page page) {
// Nothing to do if the control is not in a Page.
if (page == null) {
return;
}
// Only apply stylesheet if not already applied.
if (flags[styleSheetApplied]) {
throw new InvalidOperationException(SR.GetString(SR.StyleSheetAreadyAppliedOnControl));
}
if (page.ApplyControlStyleSheet(this)) {
flags.Set(styleSheetApplied);
}
}