public void AppendSort(string field, bool isAscending)
        {
            if (field == null)
            {
                throw new ArgumentNullException("field");
            }

            Protocol.SortProtocol sort = new Protocol.SortProtocol();

            sort.Field       = field;
            sort.IsAscending = isAscending;

            this.sorts.Add(sort);
        }
        public void AppendSort(string field, bool isAscending)
        {
            if( field == null)
                throw new ArgumentNullException("field");

            Protocol.SortProtocol sort = new Protocol.SortProtocol();

            sort.Field = field;
            sort.IsAscending = isAscending;

            this.sorts.Add( sort );
        }