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  private static void addOrder(ICriteria criteria, string sidx, string sord)
        {
            var firstDotPos = sidx.IndexOf(".");
            if(firstDotPos == -1)
            {
                criteria.AddOrder(
                    sord == "asc"
                        ? Order.Asc(sidx) 
                        : Order.Desc(sidx));
            } else
            {
                var subCriteria = criteria.CreateCriteria(sidx.Substring(0, firstDotPos));
                var remainingSidx = sidx.Substring(firstDotPos + 1);
                addOrder(subCriteria,remainingSidx,sord);
            }
        }