List group by

            var newList = from w in oldList group w by new {w.vCode, w.vName,w.vNo } into g select new { g.Key, g };
            int listcount = newList .Count();

            foreach (var item in newList )
            {
                string code= item.Key.vCode;
                string no= item.Key.vNo ;
                string name= item.Key.vName;

                if (!string.IsNullOrEmpty(vCode))
                {
                    List<StockApply> stockApplyGroupList = stockApplyList.Where(s => s.vCode== code&& s.vNo == no&& s.vName== name).ToList();
                    secDeptPlanServiceBLL.SplitStockApply(stockApplyGroupList);
                }

            }

List group by