Set Access Permissions for a Whole Group on a Directory

Question

I am writing a C# application which needs to create a folder, and then give DOMAIN\\Users full permissions. When I try to pass in Environment.UserDomainName + @"\\Users" it throws a System.Security.Principal.IdentityNotMappedException . Currently, I have this code:

DirectoryInfo dirInfo = new DirectoryInfo(path);
DirectorySecurity dirSec = dirInfo.GetAccessControl();

// All users should have full control.
dirSec.AddAccessRule(new FileSystemAccessRule(Environment.UserDomainName + @"\Users", FileSystemRights.FullControl, AccessControlType.Allow));

dirInfo.SetAccessControl(dirSec);

How can I make this "work", as in allowing users full control of the directory which is stored in path ?

This is the full exception:

Answer 1

I did some testing on my pc and found that when adding a domain user this worked:

Environment.UserDomainName + @"\Users"

For a local machine account, I had to do:

@".\Users"

Since you're testing on your home PC I'm assuming that you aren't on a domain and are trying to add the local machine Users group.

Answer 2

Group name could also be entered from outside as below ;

public static void SetGroupUsersPermission(string Path,string groupname)
{
    DirectoryInfo dirInfo = new DirectoryInfo(Path);

    DirectorySecurity dirSec = dirInfo.GetAccessControl();

     dirSec.AddAccessRule(new FileSystemAccessRule(Environment.UserDomainName + @"\" +
     groupname, FileSystemRights.FullControl, AccessControlType.Allow));

     dirInfo.SetAccessControl(dirSec);
}