C# Authenticate to an IIS and download a file

Posted on 2012-03-26
Medium Priority
Last Modified: 2012-04-06

VS2010, C#

  I'm trying to find sample code and IIS configuration information to create a file repository on an IIS server and downloading files in a directory after the user is authenticated in a C# application.

(sorry for some reason its not letting me use the code tags)

WebClient wbcWeb = new WebClient();

Uri webLocation = new Uri("http://filedownload.thedomain.com");
NetworkCredential nwCredendials = new NetworkCredential(@"lUpdater", "passwordcode");
wbcWeb.Credentials = nwCredendials;
wbcWeb.DownloadFile(webLocation, "testfile.exe");

I'm not sure if the code is good/bad but I'm thinking it's probably my web.config.  Does anyone have a sample web.config handy for basic authentication to be used in the fashion.  In addition, how about some sample code in C# for downloading the file?
Question by:sej69
LVL 14

Expert Comment

by:nishant joshi
ID: 37769635
web client which not use for your client download.you have to use Reponse.write. or response. transmit file and your file path as argument.

there are too many codes available on google for response.write() but which is gives performance issue use trasmit file.


Expert Comment

ID: 37769651
Hi, this is the source code of an ASP.Net and C# Application used to upload files to IIS server.  this will save file on web server directory named Data.
      protected void UploadFile_Click(object sender, EventArgs e)
                string fileName = FileUpload1.PostedFile.FileName;
                string location = Server.MapPath("~/Data/");
                string ext1 = System.IO.Path.GetExtension(FileUpload1.PostedFile.FileName);

                // First check the existing file on the server with same name.
                // If there is a file with same name this will replace it with new one.

                if ((FileUpload1.HasFile) && (File.Exists(fileName)))
                        FileUpload2.PostedFile.SaveAs(location + fileName);

Author Comment

ID: 37771118
I don't think that's quite right...  From what I've read to download a file (not upload from both of your posts) I either need WebClient or HttpWebRequest...  Regardless, I don't want to send a file to my server, I want to retreive a file from the server over the internet to my application running on a client with authentication.
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LVL 23

Expert Comment

ID: 37782222
I think your code is almost there.  The only thing I'm missing is the file name on the new Uri statement as below:

Uri webLocation = new Uri("http://filedownload.thedomain.com/testfile.exe");

If adding the file name to the Uri does not work, please post the exact error message or unexpected behavior you get when running the code.

Author Comment

ID: 37786638
I get a file not found (404) if I add the file to it.  Without the file on it I get a (403) access denied.  I believe my issue is with iis possibly.  I'm not 100% sure on how to set up the right authentication.  I'm using basic auth now.  I also tried digest with the same issues.

My current web.config looks like this:
<?xml version="1.0" encoding="UTF-8"?>
        <authentication mode="basic" />

Author Comment

ID: 37786646
I should also mention that I found this helpful article.  I set up my current code with the sample that's listed here with the addition of the authentication piece.

LVL 23

Expert Comment

ID: 37786764
What's the url to download the file using IE for example?  And, does IE prompt you for user/password?

Author Comment

ID: 37791736
Weird thing.  I believe it was working but the .exe file is causing an issue.  I created a file called test.txt in the directory and used the C# app to download it.  So, why is the .exe causing an issue?
LVL 23

Expert Comment

ID: 37791754
Humm... Anti-virus comes to mind. Try downloading the .exe as a.txt file as a test.

Accepted Solution

sej69 earned 0 total points
ID: 37792234
I thought that too... However, I don't have AV on this server; it's my test server. The .exe actually isn't an .exe file.  It's a text file names as an .exe that I'm using to test.  Even if I name the file .ex_ or .xxx it doesn't work.  It seems to be tied to the extension somehow like a content type related to an extension.

Author Closing Comment

ID: 37815441
Ok, it was working all the time.  I've decided to use .zip to compress the file before I send it.  I'll just need to code a decompression routine.

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