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Gets or sets the icon set used in the conditional format.
IIconSet IconSet { get; set; }
Property IconSet As IIconSet
worksheet.Range["A1:A5"].Value = new object[,] {{10}, {30}, {50}, {70}, {90}};
IIconSetCondition condition = worksheet.Range["A1:A5"].FormatConditions.AddIconSetCondition();
condition.IconSet = workbook.IconSets[IconSetType.Icon3TrafficLights1];
IIconSet iconSet = condition.IconSet;