You mean i need .net interop DLLs. But i open it , i saw two Microsoft.Office.Interop.Excel version 11 or 12.
After i add the Microsoft.Office.Interop.Excel version 12. and run program .

In this code, Sheet.Range("C" & iRow).Value = "AAA" will error.

COMException was unhandled
HRESULT: 0x80020011 (DISP_E_NOTACOLLECTION))