public void ImportData() { string sCustomer = ""; string sFile = @"C:\NSS\Excel Files\contract spares nss.xls"; Excel.ApplicationClass oExcel = new ApplicationClass(); Excel.Workbook oWorkBook = oExcel.Workbooks.Open(sFile, 0, true, 5, "", "", true, Excel.XlPlatform.xlWindows, "\t", false, false, 0, true); Excel.Worksheet oSheet = (Excel.Worksheet)oWorkBook.ActiveSheet; for (int iRow = 0; iRow < oSheet.Rows.Count; iRow++) { sCustomer = oSheet.Cells[iRow, 1].ToString(); } }On the line inside the loop I'm getting "Exception from HRESULT: 0x800A03EC"