Inherented ACL's lost when adding a new ACE to a Share directory

[AndyL69]

Hello
I've got a very strange Problem. When im adding a new ACE entry to a UNC Direcotry the inherented ACL's will be lost. When I'm adding a new ACE to a directory / file in this UNC path the inherented ACE are still available.

What's wrong ? I don't understand the difference between \\server\share and \\server\share\directory while adding a ACE

AndyL

Sample:
\\myserver\myshare
Inherited ACE: Administrators, Network Service

After adding a ACE:
\\myserver\myshare
Inherited ACE: <empty>
ACE: myUser

Sample II:
\\myserver\myshare
Inherited ACE: Administrators, Network Service

After adding a ACE:
\\myserver\myshare
Inherited ACE: Administrators, Network Service

ACE: myUser

here is my code:

    class programm
    {
        static void Main(string[] args)
        {
            String dir1 = @"\\myserver\myshare";
            String dir2 = @"\\myserver\myshare\test";
            String usr = "myuser";
            AddDirectorySecurity(dir1, usr , System.Security.AccessControl.FileSystemRights.FullControl, System.Security.AccessControl.AccessControlType.Allow);
            Console.ReadKey();
             AddDirectorySecurity(dir2, usr , System.Security.AccessControl.FileSystemRights.FullControl, System.Security.AccessControl.AccessControlType.Allow);           
            Console.ReadKey();
        }
 
        public static void AddDirectorySecurity(string FileName, string Account, FileSystemRights Rights, AccessControlType ControlType)
        {
            // Create a new DirectoryInfo object.
            DirectoryInfo dInfo = new DirectoryInfo(FileName);
 
            // Get a DirectorySecurity object that represents the 
            // current security settings.
            DirectorySecurity dSecurity = dInfo.GetAccessControl();
 
            // Add the FileSystemAccessRule to the security settings. 
            dSecurity.AddAccessRule(new FileSystemAccessRule(Account,
                                                            Rights,
                                                            ControlType));
 
            // Set the new access settings.
            dInfo.SetAccessControl(dSecurity);
 
        }
}