public void MoveMember(List <uint> nodeIds, Group from, Group to)
        {
            List <Node> nodes = NodeLayer.FindAll(delegate(Node v)
            {
                return(nodeIds.Exists(x => v.Id == x));
            });

            MoveMember(nodes, from, to);
        }
        public void AddMemberTo(List <uint> nodeIds, Group to)
        {
            List <Node> nodes = NodeLayer.FindAll(delegate(Node v)
            {
                return(nodeIds.Exists(x => v.Id == x));
            });

            AddMemberTo(nodes, to);
        }