FileStream not letting me create file on C drive

Question

I am using FileStream to create a file with givenLength.OpenFileDialog to open a file and FolderBrowserDialog to get the Location. Now the problem is when I choose Location on D:\ or E:\ drive it successfully creates the file. But when I choose C:\ drive it gives an Exception like UnauthorizedAccessException was unhandled.
C:\file.mp4 is denied. When I choose desktop as destination it gives no Exception and Does not create the file. I'm using this code

    private void createFile()
    {
        long size = fileInfo.Length;
        string name = file.FileName.Substring(file.FileName.LastIndexOf('\\') + 1, (file.FileName.Length - (file.FileName.LastIndexOf('\\') + 1)));
        string filename = "" + location.SelectedPath + name;

        FileStream outFile = new FileStream(filename, FileMode.Create);
        outFile.SetLength(size);
        outFile.Close();
    }

My UAC is disabled and Also I am an Administrator user.I'm using windows 8 pro. Can anybody explain what can be the solution ? Thanks in advance.

Are you able to create that file in other ways, e.g. from a command prompt? — Jon Skeet, Jan 04 '13 at 09:14
Again using explorer there is only folder create option on C: drive.Is there any way to gain access and create file using c#. — Mamun Sardar, Jan 04 '13 at 09:20
Try command prompt in elevated mode, start -> run then type `runas /user:administrator cmd`. This is likely a permissions issue. Also (as a test) create a folder on C: and set the NTFS permission to full control for Everyone and try writing to this folder. — Paul Aldred-Bann, Jan 04 '13 at 09:22
Try right clicking your application(exe file) and click run as administrator.. — Peter, Jan 04 '13 at 09:23
yap. When I run that .exe file as an administrator it can create. But if I want to run as user, is there any way I can gain access on c: drive. — Mamun Sardar, Jan 04 '13 at 09:28
You must enforce your application to start in admin account. see [this](http://stackoverflow.com/questions/16897395/c-creating-txt-file) — Mohammad Shokouhi Gol, Feb 15 '14 at 07:11

score 5 · Accepted Answer · answered Jan 04 '13 at 09:18

5

Permission issue. In case of Vista/Windows 7/8, C:\ drive is considered as system, and you'll need elevated privileges for your process in order to create files directly under it. Try running your process or Visual Studio as Administrator, and it should work.

Hope it helps.

answered Jan 04 '13 at 09:18

semir.babajic

731
3
9

yap. When I run that .exe file as an administrator it can create. Thanks – Mamun Sardar Jan 04 '13 at 09:28

score 0 · Answer 2 · answered Aug 24 '14 at 15:23

0

Right Click on exe => Run as Administrator => Proceed => Check now. It should work now.

answered Aug 24 '14 at 15:23

Rohan Koshti

1
1

FileStream not letting me create file on C drive

2 Answers2

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