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Sets the evaluation order for this conditional formatting rule so it is evaluated after all other rules on the worksheet.
void SetLastPriority()
Sub SetLastPriority()
worksheet.Range["A1:A5"].Value = new object[,] {{10}, {30}, {50}, {70}, {90}};
IIconSetCondition firstRule = worksheet.Range["A1:A5"].FormatConditions.AddIconSetCondition();
IIconSetCondition secondRule = worksheet.Range["A1:A5"].FormatConditions.AddIconSetCondition();
firstRule.Priority = 1;
secondRule.SetLastPriority();