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Gets or sets whether the style includes the IStyle.NumberFormat property.
Use this property to control or inspect whether the number format stored in the style is included when the style is applied.
bool IncludeNumber { get; set; }
Property IncludeNumber As Boolean
IStyle style = workbook.Styles.Add("numberStyle");
style.NumberFormat = "$#,##0.00";
style.IncludeNumber = true;
worksheet.Range["A1"].Style = style;
bool includeNumber = style.IncludeNumber;