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POMVC3 return File action causes intermittent Excel program error
 

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    <p>I have a problem that closely relates to this problem <a href="https://stackoverflow.com/questions/5063742/microsoft-excel-error-there-was-a-problem-sending-the-command-to-the-program">Microsoft Excel Error: &quot;There was a problem sending the command to the program.&quot;</a> whereby opening Excel gives <code>There was an error sending a command to the program</code> error.</p> <p>However, rather than the file existing and being opened or shortcutted-to, <strong>I am using MVC3</strong> with an action that generates a bunch of data, <strong>generates an excel file</strong> (using <a href="http://npoi.codeplex.com/" rel="nofollow noreferrer">NPOI</a>), writes it to a MemoryStream and then chucks that to the browser using the built-in <code>return File(etc)</code> ActionResult, with something akin (but shortened here to aid readability) to this:</p> <pre><code>return File(myMemoryStream, "application/vnd.ms-excel", "filename.xls"); </code></pre> <p>The first time you click the link which fires this action and returns this File - it comes up with the error. if you press ok and try it again it works, and will continue to work... forever</p> <p>Now I know this is potentially something to do with <strong>disabling DDE/plug-ins</strong> or something in Excel - but since I'm generating an excel workbook and dumping it to a memory stream rather than opening something that exists permanently on the file system, <strong>I'm not sure</strong> what options I have to remove the issue.</p> <p>Any suggestions on how to get around it? Perhaps I have the wrong mime-type?</p>
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    1. COI too have this problem...any solutions?
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    2. COFor Info: I've switched to EPPlus for creating the Excel file...it works really well, although seems a little slower. However, one thing to try is to re-set the Stream position to 0.
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    3. COI am resetting the stream position to 0 out of force-of-habit - not sure in this instance if it's actually making much difference. Have found that it's only on specific machines with "new" (2007+) versions of Excel. It may well be the case that NPOI is fully supported only with the 97-2003 format.
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