Getting error while downloading the file using Response.TransmitFile in ASP.NET

Gani_tpt 1,506

I am trying to download .asd file freom the respective location.

If i opened direct file from the folder, i can able to open.

But, when i open the file from the application, after downloading the file, getting below error (after downloading and open the file) Error ==> "Sc1.asd could not be opened because the contents are corrupt or it is currently unavailable."

screenshot

source code

        filename = "\\cas1.cds.intranet\zone1\reg10\projA\Sc1.asd"  
        Response.Clear()  
        Using oBinaryReader As BinaryReader = New BinaryReader(File.OpenRead(filename))  
            Response.ContentType = "application/octet-stream"  
            Response.AppendHeader("Content-Disposition", "attachment; filename=" + System.IO.Path.GetFileName(filename))  
            Response.TransmitFile(filename)  
            Response.Flush()  
        End Using

AgaveJoe 26,181 Reputation points

2022-06-29T11:40:53.653+00:00
Honestly, the code is very poorly designed and does not make any logical sense. You wrapped the Response.TransmitFile in a "using BinaryReader" which opens the file for reading but the BinaryReader is never used. Secondly, I don't think flush is needed. You'll want to end the response so downstream code cannot add to the response.

filename = "\\cas1.cds.intranet\zone1\reg10\projA\Sc1.asd" Response.Clear() Response.ContentType = "application/octet-stream" Response.AppendHeader("Content-Disposition", "attachment; filename=" + System.IO.Path.GetFileName(filename)) Response.TransmitFile(filename) Response.End

In your previous thread on this subject, I recommend a implementing a file handler (ashx) because the ashx does not implement the page life cycle. If you ignored this recommendation and are using the aspx page then you'll want to replace Respinse.Flush or Response.End with the following.

HttpContext.Current.ApplicationInstance.CompleteRequest
Gani_tpt 1,506 Reputation points

2022-06-29T12:29:09.507+00:00

sorry. i did the mistake.

If i use Response.End() i am getting below error.

If i use Response.Flush(), i don't get error. But, i am getting again the same popup Corrupt Error(But, File getting Downloaded. When i opened the file i am getting below error (Popup))

Below is the complete code to download the file.
filename = "\cas1.cds.intranet\zone1\reg10\projA\Sc1.asd"
Response.Clear()

Response.ContentType = "application/octet-stream"
Response.AppendHeader("Content-Disposition", "attachment; filename=" + System.IO.Path.GetFileName(filename))
Response.TransmitFile(filename)
Response.End
AgaveJoe 26,181 Reputation points

2022-06-29T14:57:41.603+00:00

Again, if the code is within an aspx page, use HttpContext.Current.ApplicationInstance.CompleteRequest as Response.End throws an exception to end the response. If the code is in an ashx file then the last line can be the TransmitFile.

The error indicates InteropServices is trying to open the file which is Word, Excel, etc. Plus the .asd extension is a temporary Word backup file which seems like an odd file to download.

If the .asd file is not a Word backup file then this is an issue with the machine that tried to open the file. Either the application that opens .asd files is not installed or the file association is incorrect.

Rather than forcing the community to guess, can you explain what you're doing and the expected results?

Albert Kallal 4,646

I have this basic setup:

   Protected Sub Button2_Click(sender As Object, e As EventArgs) Handles Button2.Click  
  
        Dim strServerFile As String = "C:\Users\AlbertKallal\source\repos\MyCalendar\UpLoadFiles\control.pdf"  
  
        Dim sFileNameOnly = Path.GetFileName(strServerFile)  
        Dim sMineType As String = MimeMapping.GetMimeMapping(sFileNameOnly)  
        ' above get mine mapping requires .net 4.5 or later  
  
        If File.Exists(strServerFile) Then  
  
            Response.Clear()  
            Response.ContentType = sMineType  
            'Response.AppendHeader("Content-Disposition", "inline; filename=" + sFileNameOnly)  
            Response.AppendHeader("Content-Disposition", "attachment; filename=" + sFileNameOnly)  
            Response.TransmitFile(strServerFile)  
            Response.End()  
  
        End If  
  
  
    End Sub

As noted, you should set the "mine" type. But, get mine mapping requires project set to 4.5 or later (which is probably a good idea on your part). And I agree - seems somewhat perplexing to try and send a "axd" file, as that is a temp back up file used by word - VERY strange to want to send that kind of file for download???

Gani_tpt 1,506 Reputation points

2022-06-30T00:33:22.183+00:00

Thanks for your good idea,

Yes. It's correct. When i am downloading the file like pdf/word/xlsx then, i don't have any issue.

But, when i am downloading the file like .asd or .vwd file then, i am getting error "file corrupt or currently unavailable.

.asd or .vwd file is a engineering drawing file like (AutoCAD or Smart Plant 3D, etc). The respective software already installed in every machine.

So, whenever downloading the file, then if they clicks the file it should automatically opened.

But, the curtent situation it will not be opening like that. It's throwing file corrupt error.

Note : If respective engineering software will not be installed in anyone of the user machine, then no need to worry about this.
Gani_tpt 1,506 Reputation points

2022-06-30T00:34:50.227+00:00

Thanks for your good idea,

Yes. It's correct. When i am downloading the file like pdf/word/xlsx then, i don't have any issue.

But, when i am downloading the file like .asd or .vwd file then, i am getting error "file corrupt or currently unavailable.

.asd or .vwd file is a engineering drawing file like (AutoCAD or Smart Plant 3D, etc). The respective software already installed in every machine.

So, whenever downloading the file, then if they clicks the file it should automatically opened.

But, the curtent situation it will not be opening like that. It's throwing file corrupt error.

Note : If respective engineering software will not be installed in anyone of the user machine, then no need to worry about this.
Albert Kallal 4,646 Reputation points

2022-06-30T02:47:16.567+00:00

Ok, that file extension and assumption on my part being word Temp file is thus wrong and can be ignored.

Not particularly sure why say pdf files and others work just fine, but a asd or whatever file does not?

I wonder if the file is currently open, or maybe damaged.

I don't see why the file extension should matter. I have to think some other missing details are missing here.
Have you tested both using in-line and attachment? Any difference?
(Attachment should cause a download to the downloads folder. In line means the browser will attempt to display and render if the browser can do so.
AgaveJoe 26,181 Reputation points

2022-06-30T11:26:36.567+00:00

You are only having issue with AutoCAD or Smart Plant 3D, etc? Try starting AutoCAD or Smart Plant 3D, etc then open the file from the application. If this works then the issue is on the client machine.
Gani_tpt 1,506 Reputation points

2022-06-30T12:59:53.423+00:00

I have tested both in-line and attachment. both are getting the same error.

After downloading the file in Download folder, getting the same error.
After downloading and trying to open from the browser, getting the same error.

But, we don't have any problem to open the pdf/word/xlsx files from the download folder.

I am thinking anything i missed out... or where we have to check this type of issue's

Note : Word/Excel getting downloaded with "Repaid" mode. But, i am able to open the document . while downloading and open the Excel document getting below popup message.

Accepted answer

Albert Kallal 4,646 Reputation points

2022-06-30T17:42:57.993+00:00
Ok, a quick google of transmits file and corruption?

Well, turns out - common problem.

First up, PDF and a lot of file formats have some "wiggle" room in terms of the file size in bytes sent. However, some binary commercial programs? They don't tolerate a SLIGHT change in the file size saved, or sent. In fact, in the old days, FTP would often cause this issue (the exact file size and length was padded as a multiple of 256. As noted, most software does not care but some does!!!

Also, be careful. Reponse.Flush, and Response.End have HUGE different meanings here.
Don't just throw mud against the wall - hope this works. Figure out WHICH one is more appropriate for your needs.

So, the solution suggested for this issue? INCLUDE the file size in the headers for the download.

Try this code :

If File.Exists(strInternalFile) Then Dim iFileInfo As New FileInfo(strInternalFile) strConType = MimeMapping.GetMimeMapping(strInternalFile) Response.Clear() Response.ContentType = strConType Response.AppendHeader("Content-Length", iFileInfo.Length.ToString) Response.AppendHeader("Content-Disposition", "attachment; filename=" + Path.GetFileName(strInternalFile)) Response.TransmitFile(strInternalFile) Response.End() Else ' send jquery toast message - file not found. ' grab control few colums left of the "right most image button" ' We just need a good toast popup position (if I use image button - toast message is too far right side ' so grab the Qty column - anything a few columns to the left is fine

it should be Mr. Obvious in above, but that Response.End is the LAST LINE AND ONLY line of code to be executed here - anything else after (more code) should NOT exist, nor be required BUT ALSO NOT RUN!!!!!

In other words, because we are dealing with the page life cycle, then MUCH concern as to what occurs in the page load event needs caution. (any code that loads up the page, the grid, the tree view or ANYTHING else needs to be placed inside of the page load even wrapped in the ALL super duper important Is not page post back).

Eg this:

Protected Sub Page_Load(ByVal sender As Object, ByVal e As System.EventArgs) Handles Me.Load If IsPostBack = False Then ' code here to load gride, or tree view etc. - ONLY FIRST page load!! End if
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Gani_tpt 1,506 Reputation points

2022-07-04T10:11:35.697+00:00

Thanks for your response.

I am getting below error while i am using Response.End in Server. But, i didn't get any error while using the same in Local system.

How it is possible and how to handle this issue..

Albert Kallal 4,646 Reputation points

2022-07-04T15:52:03.057+00:00

I would test/try with the Response.End removed. You could also put a try/catach block around the Response.End.

From that error message, it looks like transmit file is sufficient (and the response is ending for you).

So, try without Response.end, or better yet, put a try/catch block around the Response.End - see how that goes.

As pointed out, do be aware of what you have occurring on page load - it should have a check for ispostback, and any code that loads up things on the page should only occur one time - on the "real" page load. So, this is hard to debug without having all your code here.
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Getting error while downloading the file using Response.TransmitFile in ASP.NET

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