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I am saving sample data table from database to Excel using OLEDB connection.

If I save the excel file with [.XLS] extension, I can open the file and see the stored data table.

But if I create the Excel file with [.XLSX] format, after moving datatable,
if I try to open it I am getting error like
"File format or file extension is incorrect. Check whether file has corrupted or file extension doesnot match with file format" and I cannot open the Excel file.

I am using Windows 7 and tried installing "Acess Database engine" but still getting the same error.

Below is the src code in which I am trying to create simple excel file with .XLSX format.
(File path selected is C:\\Users\Vijay\Desktop\Recipe.XLSX)

Dim saveDialog As New System.Windows.Forms.SaveFileDialog
        saveDialog.Title = "ExportFile"
        saveDialog.Filter = "MS Office Excel2007|*.xlsx"
        'saveDialog.DefaultExt = "xlsx"
        'saveDialog.SupportMultiDottedExtensions = True
        saveDialog.FileName = "Recipe"

        If saveDialog.ShowDialog() = Windows.Forms.DialogResult.OK Then

            ExpFileName = saveDialog.FileName
        End If

        Dim ConString As String = ""

    ConString = String.Format("Provider=Microsoft.ACE.OLEDB.12.0;Extended Properties=""Excel 12.0;HDR=YES"";Data Source={0}", ExpFileName)
        Dim conObj As New System.Data.OleDb.OleDbConnection()
        conObj.ConnectionString = ConString

        Dim createTable As String = "CREATE TABLE sheet1(VJ1 char(255),VJ2 char(255))"

        Dim cmd As System.Data.OleDb.OleDbCommand = New System.Data.OleDb.OleDbCommand(createTable, conObj)


Thanks in Advance,

Updated 4-Apr-23 3:05am

In your code ' Extended Properties=""Excel 12.0;HDR=YES ' of your connection string .a 'Xml' should be added to make ' Extended Properties=""Excel 12.0 Xml;HDR=YES '.
.So you have to modify your connection string as :

ConString = String.Format("Provider=Microsoft.ACE.OLEDB.12.0;Extended Properties=""Excel 12.0 Xml;HDR=Yes"";Data Source=" & ExpFileName)

It seems to be used to specify or validate data in excel sheet .i.e. i am not sure why this is so important but
This connection string works as of your scenario.
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Vijay hit 11-Jun-13 7:37am    
Hi Rajan,

Thanks a lot. Just by changing connection string it worked well.
As you mentioned we need to add Xml to Extended property.
'Xml' should be added to make ' Extended Properties=""Excel 12.0 Xml;HDR=YES '.

Offf... I was sick of searching for the answer from 2 days. Really it helped a lot.

Thanking you once again.
Surendra Adhikari SA 11-Jun-13 7:47am    
welcome, i have already tested it in my mechine .and thanks for your +5 .
Your code generates the "old" Excel format. When you just change the extension of the old format to ".xlsx", Excel throws that exception. When you save a file in the newer format nad change the extension to ".xls", Excel will warn you that the file could be corrupted, but you can still open it. So: just make sure the extension matches the format.
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Vijay hit 11-Jun-13 5:37am    
Hi Bernhard,

Thanks for the valuable answer.
Do you mean the way I am saving file using OLEDB is old method. In that case could you please let me know
how I can save .XLSX in new format(May be piece of code).

Or you mean I might be saving in .xls format,In that case my answer is I am saving file in new format i.e .XLSX (You can now see in my question which I have modified and also mentioned the path).

I am really exhausted to find the solution for this.

Appreciate comment.

This content, along with any associated source code and files, is licensed under The Code Project Open License (CPOL)

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