c# application excel vsto conditional formatting

Question

I have a VSTO c# application and I am trying to apply conditional formatting so when the value in Column V is set to No make the whole row grey. headercount variable is my last column number

      Microsoft.Office.Interop.Excel.FormatCondition format7 = (Microsoft.Office.Interop.Excel.FormatCondition)(uiWorksheet.get_Range("B7:Z" + headercount,
  Type.Missing).FormatConditions.Add(Microsoft.Office.Interop.Excel.XlFormatConditionType.xlExpression, Microsoft.Office.Interop.Excel.XlFormatConditionOperator.xlEqual,
  "V=No", Type.Missing, Type.Missing, Type.Missing, Type.Missing, Type.Missing));
        format7.Interior.Color = true;

I tried the below but it doesnt work - any ideas?

Answer 1

I was able to get this to work using Excel's INDIRECT function with the conditional formatting triggered by the Application.SheetChange event. Please note that the internal quotation marks for the formula need to be escaped.

Microsoft.Office.Interop.Excel.FormatCondition format7 = (Microsoft.Office.Interop.Excel.FormatCondition)(uiWorksheet.get_Range("B7:Z" + headercount,
Type.Missing).FormatConditions.Add(Microsoft.Office.Interop.Excel.XlFormatConditionType.xlExpression, Microsoft.Office.Interop.Excel.XlFormatConditionOperator.xlEqual,
"=INDIRECT(\"V\"&ROW())=\"No\"", Type.Missing, Type.Missing, Type.Missing, Type.Missing, Type.Missing));

format7.Interior.Color = System.Drawing.Color.Gray;