Problem with Microsoft.Interop.Excel.dll

[mcnam]

Hi every body,
I am getting a problem when i work with Microsoft.Inter op.Excel.dll
I tried to export and modify excel file with my conditional formatting for each cell of rows.
the function is :
Microsoft.Offic e.Interop.Excel .Range cellitem;
cellitem..Forma tConditions.Add (XlFormatCondit ionType.xlExpre ssion, XlFormatConditi onOperator.xlEq ual, "<my formular>", "");
i was working good in English region but when i changed the region to Germany(de) it was crash.
I don't know what is wrong .
Could you help me any solutions!
Thanks,

[kenobewan]

This may be a case for globaliztion, can be easily set up in your config file.