Open file in browser or application getting the page's name as the file's name

Hi, I'm am trying to get a file to open in either a browser or application depending on the mime type. I'am using the following code in the page load.

protected void Page_Load(object sender, EventArgs e)

{ if (!IsPostBack)   


DocumentInfo document = (DocumentInfo)Session["View_Document"];

StreamFile(document.Document, document.DocumentName, document.FileType.MimeType);




private void StreamFile(byte[] fileData, string originalFileName, string mimeType)





Response.ContentType = mimeType;

Response.AddHeader("Content-Type", mimeType);

Response.AddHeader("Content-Disposition", "inline;filename=" + originalFileName);



catch (Exception)








DocumentInfo class holds the bytes, the mime type and the file name.

If the document is a pdf or image it opens in the browser no problems, but if i go to save the pdf the name of the pdf is the DocumentView.pdf, (The page is called DocumentView.aspx) and not the file name.

If the document is a file which requires an external application to launch, such as an excel file, i get a warning message from excel: 'The file you are trying to open, 'DocumentView.aspx', is in a different format than specified by the file extension........Do you want to open the file now?' on clicking yes excel is opened and the file name is 'DocumentView.aspx', on clicking no excel is still opened and the file name is the correct file name 'filename.xls'.

If i change Response.AddHeader("Content-Disposition", "inline;filename=" + originalFileName); to Response.AddHeader("Content-Disposition", "attachment;filename=" + originalFileName); the file name is correct in the open save dialog, but i dont want this i want to open the file in browser by default.

 How do i get the correct file name to be recognised instead of the page's Name?


1/22/2009 12:32:25 AM 93655 articles. 6 followers. Follow

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 You running excel 2007?

Seems like it is happening with the office 2007, because of some optimization stuff. There seem to be a registry fix to suppress this message.

Also, with inline file download, I am not sure browser will remember the name of the file it opened

Kumar Reddi
1/22/2009 2:12:36 AM


I am running excel 2007, but even when the pdf is successfully displayed in a browser, going to the save button of the acrobat reader plugin  the name of the file is then name of the page with aspx replaced with pdf. Excel is complaining about opening an aspx file even though the actual file is a xls
1/22/2009 3:08:21 AM

I think these messages are browser specific and varies by browsers and operating systems.

Bind GridView to Dynamically created DataTable | Bind DataTable to DropDownList

My Blog
1/22/2009 11:12:14 AM

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