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Gets or sets the number format applied to a cell if the conditional formatting rule evaluates to true.
This property returns the format string assigned to the conditional formatting rule.
string NumberFormat { get; set; }
Property NumberFormat As String
worksheet.Range["A1:A3"].Value = new object[,] {{85}, {95}, {105}};
IFormatCondition condition = (IFormatCondition) worksheet.Range["A1:A3"]
.FormatConditions.Add(FormatConditionType.CellValue, FormatConditionOperator.Greater, "90", null);
condition.Interior.Color = Color.Yellow;
condition.NumberFormat = "0.00";
string numberFormat = condition.NumberFormat;