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We have a code that exports some data to excel, then uses that excel file to generate a pdf file using the exportAsFixedFormat function. Now it is failing with system exception regularly.

the below is the code
                          paramExportFilePath, paramExportQuality,
                          paramIncludeDocProps, paramIgnorePrintAreas,
                          paramFromPage, paramToPage, paramOpenAfterPublish)

            ' Close book
            'Exit Excel

below is the exception error we are getting
System.Exception: System.Exception: System.Runtime.InteropServices.COMException (0x800A03EC): Exception from HRESULT: 0x800A03EC     at Microsoft.Office.Interop.Excel._Workbook.ExportAsFixedFormat(XlFixedFormatType Type, Object Filename, Object Quality, Object IncludeDocProperties, Object IgnorePrintAreas, Object From, Object To, Object OpenAfterPublish, Object FixedFormatExtClassPtr)

What I have tried:

Please provide suggestions for a permanent fix
Updated 28-Feb-22 4:32am
Richard MacCutchan 28-Feb-22 4:34am    
The error code appears to be a catch all, you may need to try Microsoft's help forums.

Just a wild guess, as you didn't show much of the code (nor the line that throws):

maybe your code applied some changes to the workbook, and Excel wants to know whether it should save or not.

If you want to close without saving, just set
oBook.Saved = true
before closing.

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Take a look here: How to properly release Excel COM objects: C# code examples[^]

Excel.Application app = null;
Excel.Workbooks books = null;
Excel.Workbook book = null;
Excel.Sheets sheets = null;
Excel.Worksheet sheet = null;
Excel.Range range = null;
    app = new Excel.Application();
    books = app.Workbooks;
    book = books.Add();
    sheets = book.Sheets;
    sheet = sheets.Add();
    range = sheet.Range["A1"];
    range.Value = "Lorem Ipsum";
    book.SaveAs(@"C:\Temp\ExcelBook" + DateTime.Now.Millisecond + ".xlsx");
    if (range != null) Marshal.ReleaseComObject(range);
    if (sheet != null) Marshal.ReleaseComObject(sheet);
    if (sheets != null) Marshal.ReleaseComObject(sheets);
    if (book != null) Marshal.ReleaseComObject(book);
    if (books != null) Marshal.ReleaseComObject(books);
    if (app != null) Marshal.ReleaseComObject(app);
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