Using NPOI to open both XLS and XLSX for reading

Question

I am having an issue opening an Excel 2007 (xls) Workbook.  I receive the following error:
The supplied data appears to be in the Office 2007+ XML. You are calling the part of POI that deals with OLE2 Office Documents. You need to call a different part of POI to process this data (eg XSSF instead of HSSF)
My code for reading xls file is:
// Workbook object
HSSFWorkbook hssfworkbook;
// create workbook object using file stream
using (FileStream file = new FileStream(path, FileMode.Open, FileAccess.Read))
hssfworkbook = new HSSFWorkbook(file);
  Please tell me the solution for above issue.
Thank you.
         

Answer 1

Hi Vani d,
I am afraid that NPOI is third-party dll. This is out of our support. So i will move to off-topic forum.
But here are some useful info as below
Please note the following code, When opening a workbook,  a .xls using HSSFWorkbook,  a .xlsx using   XSSFWorkbook. Please refer to
http://poi.apache.org/spreadsheet/quick-guide.html for more information.
Workbook wb = new HSSFWorkbook();
FileOutputStream fileOut = new FileOutputStream("workbook.xls");
wb.write(fileOut);
fileOut.close();
Workbook wb = new XSSFWorkbook();
FileOutputStream fileOut = new FileOutputStream("workbook.xlsx");
wb.write(fileOut);
fileOut.close();
Have a nice day!
Kristin
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