Exception while adding a formula to excel via csharp Interop

Hi,

i'm trying to add an if-condition to an specific cell in excel via csharp interop api.
But wenn i run the code, i got following exception:
"Exception from HRESULT: 0x800A03EC"
- without the if-condition, it would run perfectly
- i also implemented the cultureinfo-workaround described at the microsoft-url you can see at the sourcecode
- i use following Assembly: C:\Program Files\Microsoft Visual Studio 9.0\Visual Studio Tools for Office\PIA\Office12\Microsoft.Office.Interop.Excel.dll

Any ideas, what's wrong?

using Excel = Microsoft.Office.Interop.Excel;
using System.Reflection;
...
Excel.Application xlApp = new Excel.Application();
xlApp.Visible = false;
//http://support.microsoft.com/default.aspx?scid=kb;en-us;320369 workaround 
System.Globalization.CultureInfo ci = new System.Globalization.CultureInfo("en-US");
System.Threading.Thread.CurrentThread.CurrentCulture = ci;
...
Excel._Workbook wb = (Excel._Workbook)(xlApp.Workbooks.Add(Missing.Value));	
Excel._Worksheet ws = (Excel._Worksheet)wb.Sheets.Add(Missing.Value, Missing.Value, Missing.Value, Missing.Value);
...
Excel.Range formularRange = ws.get_Range("D2","D2");
//working code: 
formularRange.Formula = "=C2/B2";
//code throwing exception
formularRange.Formula = "=IF(B2=0;0;C2/B2)";

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hortiAsked:
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Rory ArchibaldConnect With a Mentor Commented:
Try using:

formularRange.Formula = "=IF(B2=0,0,C2/B2)";
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