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Asked: 2026-05-11T14:07:09+00:00

I’m trying to stream a text file (CSV) to the response, and the following

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I’m trying to stream a text file (CSV) to the response, and the following code works perfectly in Firefox 3, but when I use IE, it looks like it wants to download the actual .aspx page, and complains that the file contents don’t match the file extension or type. If I then choose to download the file anyway, it correctly downloads the CSV data and opens it in Excel. What am I doing wrong?

    DataTable dt = ExtensionsProvider.ListPrivateCallCostsForCsv(reportFilter.BusinessUnit, reportFilter.StartDate,                                                              reportFilter.EndDate);     Response.Clear();     Response.Buffer = true;     Response.ContentType = 'text/csv';     Response.AddHeader('Content-Disposition', 'filename=' + GetExportFileName());      DataTableHelper.WriteCsv(dt, Response.Output, false);     Response.End();
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  1. Response.AddHeader('Content-Disposition', 'filename=' + GetExportFileName());

    Should be:

    Response.AddHeader('Content-Disposition', 'attachment;filename=' + GetExportFileName());

    Without a main Content-Disposition value, IE will just use the trailing part of the URL — something.aspx — as a filename.

    (The above assumes GetExportFileName() returns a sanitised filename stripped of most punctuation. What can go in a header parameter as token or quoted-string in IE is a matter of some annoyance; see this question for details)

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