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ASP.NET C# file upload failing

Posted on 2009-04-01
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Last Modified: 2012-05-06
I am using an asp:FileUpload controll to upload a file via a c# website to an IIS server running on a Windows Server 2003 machine but ive hit a bit of a snag.

The files i am trying to upload have restricted access permissions which are limited to a select handfull of specific users, not including the aspnet user. As far as i was aware the browser posts the file and as the browser is being run by one of the files allowed users the file should be posted to the server with no issues. This however does not seem to be the case, the file does not upload, i have tried changing the file to give the aspnet user permissions and the file then uploads with no issues. The aspnet user has access to the location where the files will be saved.

Hence i am now asking for your kind assistance in order to help me solve this issue. I also have one further question which may decide the outcome for me which is as follows; i have a crystal report viewer running on the website which will later view these files when they have been uploaded, if the file permissions are restricted as such will the report viewer be unable to display the file?

I have posted my upload code below, thankyou in advance.
protected bool SubmitUpload()

    {

        try

        {

            if (uplRptLoc.PostedFile != null && uplRptLoc.PostedFile.ContentLength > 0 &&

                uplRptLoc.PostedFile.FileName.Substring(uplRptLoc.PostedFile.FileName.Length - 4) == ".rpt")

            {

                // match the report path and uploaded file name and upload file

                string reportDirectory = Huntercombe.Configuration.ReportPath;

                string fileName = System.IO.Path.GetFileName(uplRptLoc.PostedFile.FileName);

                this.uplRptLoc.PostedFile.SaveAs(System.IO.Path.Combine(reportDirectory, fileName));
 

                return true;

            }

            else

            {

                return false;

            }

        }

        catch

        {

            return false;

        }

    }

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Question by:sypher1987
4 Comments
 
LVL 23

Expert Comment

by:apresto
ID: 24039685
As far as i am aware the ASPnet user needs to have access to the directory you are uploading to
0
 
LVL 7

Expert Comment

by:davidmuto
ID: 24039692
How about giving the Network Service account modify rights to the upload directory...worked for me.
0
 
LVL 26

Accepted Solution

by:
Anurag Thakur earned 250 total points
ID: 24039742
use impersonation i.e. run your website under a user who has rights to write to the folder where you are uploading the files to
to do that there are 2 methods
add impersonation tag in the web.config
or in the IIS change the user under which the website runs to the user who has got permissions
0
 
LVL 9

Expert Comment

by:Gorkem Yuksel
ID: 24039868
Hi,

If the file is larger than 4 MB, then you need to modify your web.config to allow for larger file sizes.  By default, anything over 4 MB will fail.

To increase the size to something more realistic, edit the HttpRuntime tag in your web.config file.  If one doesn't exist, you can create one.

It may already have additional attributes, but the one to ensure is: maxRequestLength

The HttpRuntime tag should like something like this to accept files upto 50MB:  
*note that the entry is in KB*

<HttpRuntime maxRequestLength="51200" />

Cheers,

G.
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