SET ADMIN ONLY ACCESS PERMISSION ON A FILE

namespace PermissionTest

{

public class PermissionControl

{

List usernames = new List();

List adminusers = new List();

string file_path = "C:\\TEXT1.txt";

public PermissionControl()

{

try

{

GetALLUsersList();

Load_Admin_Users();

}

catch (Exception ex) {

MessageBox.Show(ex.ToString());

}

RemoveAccess(file_path);

}

// -- this function all the users of the system on the generic list --

private void GetALLUsersList()

{

DirectoryEntry directoryEntry = new DirectoryEntry("WinNT://" + Environment.MachineName);

foreach (DirectoryEntry child in directoryEntry.Children)

{

if (child.SchemaClassName == "User")

{

usernames.Add(child.Name);

}

}

}

// -- this function admin users of the system on the generic list --

private void Load_Admin_Users()

{

using (DirectoryEntry groupEntry = new DirectoryEntry("WinNT://./Administrators,group"))

{

foreach (object member in (IEnumerable)groupEntry.Invoke("Members"))

{

using (DirectoryEntry memberEntry = new DirectoryEntry(member))

{

adminusers.Add(memberEntry.Name);

//Console.WriteLine(memberEntry.Name);

}

}

}

//Console.ReadKey();

}

//--- this method is used to remove access of non admin users on a file --

private void RemoveAccess(string FilePath)

{

try

{

FileSecurity fs = File.GetAccessControl(FilePath);

foreach (string uname in usernames)

{

if (adminusers.Contains(uname) == false)

{

try

{

fs.AddAccessRule(new FileSystemAccessRule(System.Environment.UserDomainName + "\\" + uname, FileSystemRights.FullControl, AccessControlType.Deny));

File.SetAccessControl(FilePath, fs);

}

catch (System.Security.SecurityException se)

{

MessageBox.Show(se.ToString());

}

catch (Exception ex)

{

MessageBox.Show(ex.ToString());

}

}

}

}

catch (Exception ex)

{

MessageBox.Show(ex.ToString());

}

MessageBox.Show("Admin Permissions applied.", "Test");

// @System.Environment.UserDomainName\AccountName"

// "denied from FullControl access.");

}

}

static class Program

{

static string LogFile = Application.StartupPath + "\\LogFile.txt";

///

/// The main entry point for the application.

///

[STAThread]

static void Main()

{

//Application.EnableVisualStyles();

//Application.SetCompatibleTextRenderingDefault(false);

//Application.Run(new PermissionTest ());

// Execute the command synchronously.

// first of create a log file

if (!File.Exists(LogFile))

{

File.Create(LogFile);

}

PermissionControl p = new PermissionControl();

}

}

}