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Excel can not able to open the file...

Thread ID:





121309 Nov 30,2015 08:39 AM UTC Dec 8,2015 05:16 AM UTC ASP.NET Web Forms 2
Tags: XlsIO
Suresh Thota
Asked On November 30, 2015 08:39 AM UTC

Hi Team,

Thank you very much for your mails.

Some how I have managed to execute an application. But now, excel can not able to open the file.

Please find the attached document, which contains the the steps, whatever I am following in source code.

Requesting you, kindly give me the solution for this issue.

Suresh Thota

Attachment: MyAtt_a9d2d5e5.zip

Ishwarya Narayanan [Syncfusion]
Replied On December 1, 2015 11:49 AM UTC

Hi Suresh, 

This error occurs when there is mismatch between the file format and its extension. This can be resolved by setting workbook version set to the required version.


·         To save a workbook in Excel2003 format, set the workbook version to Excel97to2003 and save the file with extension ‘.xls’ i.e. binary file format.

·         To save a workbook in Excel 2007/Excel2010/Excel2013 formats, set the workbook version to Excel2007/Excel2010/Excel2013 respectively and save the file with extension ‘.xlsx’ i.e. open xml file format.


The below code example illustrates the same.

string fileName = Server.MapPath("App_data/Sample.xls");

IWorkbook workbook = application.Workbooks.Open(fileName, ExcelOpenType.Automatic);


IWorksheet sheet = workbook.Worksheets[0];

workbook.Version = ExcelVersion.Excel2007;


workbook.SaveAs(this.TextBox1.Text + ".xlsx", ExcelSaveType.SaveAsXLS, Response, ExcelDownloadType.PromptDialog, ExcelHttpContentType.Excel2007);



We have provided a sample as per your scenario in the below link for your reference. Kindly try with this and let us know.


Sample Link:



Please let us know if you need any clarification. 


Ishwarya N

Rilfanayasmin Jamal Nasar [Syncfusion]
Replied On December 8, 2015 05:16 AM UTC

From: suresh thota [mailto:suresh_thota@yahoo.com]
Sent: 12/02/2015 01:22 AM
To: Syncfusion Support <support@syncfusion.com>
Subject: Re: Syncfusion support community forum 121309, Excel can not able to open the file..., has been updated.

Hi Team,

Thank you for your reply.

Yes. I have seen from one the the SyncFusion URL. Its working now.

Thank you very much for your support.


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