i want to create an app to remove read and write permission of a file

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i want to create an app which remove read and write permission of a file,using C#. how can i do it?

additional information moved from comment below [Nelek]

C#

using System.Security.AccessControl;
try
{
   FileStream oFileStreamDec = new FileStream(@"H:\Tripz\Testi\6.jpg", FileMode.Create, FileAccess.ReadWrite, FileShare.None);
   // Close the File first
   oFileStreamDec.Close();
   //Create file security and apply rules to it
   FileSecurity oFileSecurity = new FileSecurity();
   oFileSecurity.AddAccessRule(new System.Security.AccessControl.FileSystemAccessRule("SYSTEM", System.Security.AccessControl.FileSystemRights.FullControl, System.Security.AccessControl.AccessControlType.Allow));
System.IO.File.SetAccessControl(@"H:\Tripz\Testi\6.jpg", oFileSecurity);
}
catch
{
   MessageBox.Show("Error");
}

Posted 6-Nov-14 6:56am

Anuruddha_r

Updated 6-Nov-14 10:28am

v4

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Comments

Richard MacCutchan 6-Nov-14 13:28pm

You do it by writing code. Exactly which part of this program are you unable to do?

Richard Deeming 6-Nov-14 13:30pm

For NTFS permissions, start with the System.Security.AccessControl.FileSecurity class[^].

ZurdoDev 6-Nov-14 14:03pm

Do you have a question?

Anuruddha_r 6-Nov-14 14:17pm

i use below code to remove read write permission of a file How Can I Give W/R permission Back

Richard Deeming 6-Nov-14 14:32pm

Don't post your code as an answer to your question. Use the "Improve question" link instead.

Anuruddha_r 6-Nov-14 14:57pm

Ok ....... using my posted code i removed my files's read and write permission nw i can't open a file... so i want to give that same file to read and write permission so then i can open that file

Anuruddha_r 6-Nov-14 14:56pm

Ok ....... using my posted code i removed my files's read and write permission nw i can't open a file... so i want to give that same file to read and write permission so then i can open that file

BillWoodruff 6-Nov-14 15:06pm

Why are you creating and opening a FileStream 'oFileStreamDec, then immediately closing it, and never using it in the rest of your code ?

Richard MacCutchan 7-Nov-14 4:54am

He does use it, the code modifies its security attributes.

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Dave Kreskowiak · Accepted Answer · 2014-11-06T10:10:00

Solution 3

Hang on. The question no one is asking is WHY??

If the user running your code, which runs AS THE USER!!, has the permissions to remove/add those permissions, they also have the permissions to add them back to the file WITHOUT YOUR APP just by doing it in Explorer.

Your attempt at "security" is pointless.

Posted 6-Nov-14 10:10am

Dave Kreskowiak

Comments

Sergey Alexandrovich Kryukov 6-Nov-14 16:12pm

Best answer so far (and the only reasonable one). My 5.
—SA

BillWoodruff 7-Nov-14 2:17am

Actually, Dave, I asked "why" one hour before you posted this "solution," but, I asked in a comment.

Not that I'm saying that saying there's not a solution isn't a solution :)

Afzaal Ahmad Zeeshan · Accepted Answer · 2014-11-06T09:56:00

Why not first go and read some blog posts and already written solutions for this?

First of all, go and read the Access Control[^] by Microsoft. Secondly, you can learn the FileIOPermission class from the MSDN[^]. They will provide you with minimal (but probably maximum) information related to your project.

The second link (MSDN link) has the detailed information for the permissions that you can set to the File using that code.