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Returns the collection of styles in the current workbook.
This property returns an IStyleCollection that provides access to the built-in and custom styles available in the workbook.
IStyleCollection Styles { get; }
ReadOnly Property Styles As IStyleCollection
IStyleCollection styles = workbook.Styles;
IStyle style = styles.Add("DataStyle");
style.Font.Bold = true;
worksheet.Range["A1"].Style = style;