Response Content type as CSV - asp.net

Question

I need to send a CSV file in HTTP response. How can I set the output response as CSV format?
This is not working:
Response.ContentType = "application/CSV";

Answer 1

Using text/csv is the most appropriate type.
You should also consider adding a Content-Disposition header to the response. Often a text/csv will be loaded by a Internet Explorer directly into a hosted instance of Excel. This may or may not be a desirable result.
Response.AddHeader("Content-Disposition", "attachment;filename=myfilename.csv");
The above will cause a file "Save as" dialog to appear which may be what you intend.

Answer 2

MIME type of the CSV is text/csv according to RFC 4180.

Answer 3

Use text/csv as the content type.

Answer 4

Over the years I've been honing a perfect set of headers for this that work brilliantly in all browsers that I know of
// these headers avoid IE problems when using https:
// see http://support.microsoft.com/kb/812935
header("Cache-Control: must-revalidate");
header("Pragma: must-revalidate");
header("Content-type: application/vnd.ms-excel");
header("Content-disposition: attachment; filename=$filename.csv");

Answer 5

Try one of these other mime-types (from here: http://filext.com/file-extension/CSV )
text/comma-separated-values
text/csv
application/csv
application/excel
application/vnd.ms-excel
application/vnd.msexcel
Also, the mime-type might be case sensitive...

Answer 6

Just Use like that
Response.Clear();
Response.ContentType = "application/CSV";
Response.AddHeader("content-disposition", "attachment; filename=\"" + filename + ".csv\"");
Response.Write(t.ToString());
Response.End();

Answer 7

In ASP.net MVC, you can use a FileContentResult and the File method:
public FileContentResult DownloadManifest() {
byte[] csvData = getCsvData();
return File(csvData, "text/csv", "filename.csv");
}

Answer 8

I have found that the problem with IE is that it sniffs the return data and makes up its own mind about what content-type it thinks it has been sent. There are a number of side effect that this causes, such as always openning a saveAs dialog for text files because you are using compression of data trasnferes. The solution is (in php code)......
header('X-Content-Type-Options: nosniff');

Answer 9

I suggest to insert an '/' character in front of 'myfilename.cvs'
Response.AddHeader("Content-Disposition", "attachment;filename=/myfilename.csv");
I hope you get better results.

Answer 10

Setting the content type and the content disposition as described above produces wildly varying results with different browsers:
IE8: SaveAs dialog as desired, and Excel as the default app. 100% good.
Firefox: SaveAs dialog does show up, but Firefox has no idea it is a spreadsheet. Suggests opening it with Visual Studio! 50% good
Chrome: the hints are fully ignored. The CSV data is shown in the browser. 0% good.
Of course in all of these cases I'm referring to the browsers as they come out of they box, with no customization of the mime/application mappings.

Answer 11

For C# MVC 4.5 you need to do like this:
Response.Clear();
Response.ContentType = "application/CSV";
Response.AddHeader("content-disposition", "attachment; filename=\"" + fileName + ".csv\"");
Response.Write(dataNeedToPrint);
Response.End();
return new EmptyResult(); //this line is important else it will not work.