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Have an error message when opening xlsx file

I have an issue when I try to open xlsx file after converting html to xlsx.
all things are fine until I send the Binary result on using Response.BinaryWrite.
Response.ContentType = “application/xlsx”;
Response.AddHeader(“Content-disposition”, $“attachment;filename=Filename.xlsx;”);
var result = Encoding.Default.GetBytes(document);
//ByteArrayToFile(@“export.xlsx”, result); at this step if I save the Binary directly in file it’s work.

the result when I download th content in my front. I have this message :

We’re sorry. We can’t open {file} because we found a problem with its contents.

image.png (4.4 KB)
it’s opend when I click on OK.
I want to avoid this message please help me.


The issue does not seem to be related to Aspose.Cells APIs. Could you please add a line (at the end) to your code segment if it makes any difference.

Also, try using latest version of Aspose.Cells v21.7 (if you are not already using it). If you still find any issue with latest version of Aspose.Cells, kindly create a sample project (runnable), zip the project and post us to reproduce the issue (with resource files) on our end, we will check it soon.

Thank you, it’s work now :blush:


Good to know that your issue is sorted out by the suggested line of code. In the event of further queries or issue, feel free to write us back.