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All three types derive from the Style class, and NamedStyle derives from GlobalStyle.

You cannot create a CellStyle, only manipulate existing ones as part of the objects they apply to. To create a GlobalStyle, use Workbook.CreateStyle(). To create a NamedStyle, use Workbook.CreateNamedStyle(). To get a NamedStyle from an existing document, use Workbook.GetNamedStyle().