public User(User u)
        {
            ID = u.ID;
            userName = u.userName;
            password = u.password;

            data = u.GetData();
            userGroups = u.GetUserGroups();
        }
 public void SetUser(User u)
 {
     user = u;
     accessLevels = user.GetUserGroups();
     accessRights = user.GetAccessRights();
 }