if (!CurrentPage.ACL.Exists(roles.Items[i].Value)){ //This code work fin ac = new AccessControlEntry(roles.Items[i].Value, AccessLevel.Read, SecurityEntityType.Role); CurrentPage.ACL.Add(ac); CurrentPage.ACL.Save(); } But how can I remove a role from ACL on CurrentPage? //I have tryed this, but it did not work. if (CurrentPage.ACL.Exists(roles.Items[i].Value)) { CurrentPage.ACL.Remove(roles.Items[i].Value); CurrentPage.ACL.Save(); }