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VB 2005 .net 2.0

I have a folder which has about 5 inherited permissions. I want to remove or change one of these permissions. In vb 6, I was able to do this through API but would like to do this in .net.

It seems I can only do this if I break inheritance on all permissions. Here's my code.

Dim dInfo As New DirectoryInfo(FileName)
Dim dSecurity As DirectorySecurity = dInfo.GetAccessControl()

dSecurity.RemoveAccessRuleSpecific(New FileSystemAccessRule(Account, Rights, IFlags, _
               PropagationFlags.InheritOnly, AccessControlType.Allow))

dInfo.SetAccessControl(dSecurity)

I tried including

dSecurity.SetAccessRuleProtection(True, True)

before the SetAccessControl but this breaks inheritance on all the permission not just this specific one.

So how can I remove one inherited user group called Domain User with Full permission on Files only and leave the other permissions still inherited?

Thanks

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