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Gets the IconSetType enumeration value that identifies this icon set.
IconSetType ID { get; }
ReadOnly Property ID As IconSetType
IIconSetCondition condition = worksheet.Range["A1:A5"].FormatConditions.AddIconSetCondition();
IIconSet iconSet = workbook.IconSets[IconSetType.Icon3TrafficLights1];
condition.IconSet = iconSet;
IconSetType iconSetType = condition.IconSet.ID;