ExcelApplication xla = new ExcelApplication();
          Workbook wb = xla.Create();

          //--- Create a range of the cells that will have the conditional formatting.
          Range vRange = wb.Worksheets[0].CreateRange("$B$2:$F$10");
          Area vArea = vRange.Areas[0];

          //--- Get the conditional format for the first cell within this range.
          ConditionalFormat vCndFmt = vArea[0,0].ConditionalFormat;

          //--- Modify the first condition.
          Condition vCondition = vCondFmt.Condition[0];
          vCondition.ChangeConditionType(Condition.Comparison.CellValueLessThan, "=100");

          vRange.SetConditionalFormat(vCondFmt);
        

          Dim xla As New ExcelApplication()
          Dim wb As Workbook = xla.Create()

          '--- Create a range of the cells that will have the conditional formatting.
          Dim rng As Range = wb.Worksheets(0).CreateRange("$B$2:$F$10")
          Dim ar As Area = rng.Areas(0)

          '--- Get the conditional format for the first cell within this range.
          Dim CondFmt As ConditionalFormat = ar(0,0).ConditionalFormat

          '--- Modify the first condition.
          Dim cond As Condition = CondFmt.Condition(0)
          cond.ChangeConditionType(Condition.Comparison.CellValueLessThan, "=100")

          rng.SetConditionalFormat(vCndFmt)