public void CreateBetApp(BetModelView model) { var Itemrepo = new ItemService(); string word = "ABCDEFGHIJKLMNOPQRSTUVWXYZ"; Random rd = new Random(); int num1 = rd.Next(-1, 24); string StampDate = DateTime.Now.Year.ToString() + DateTime.Now.Month.ToString() + DateTime.Now.Day.ToString() + DateTime.Now.Hour.ToString(); string BetRef = word.Substring(num1, 3) + StampDate + "-" + model.itemref; using (var Betrepo = new BetService()) { Bet _Bet = new Bet { ItemRef = BetRef, BetterName = model.BetterName, NewPrice = model.Newprice, IsAccept = 0, date = DateTime.Now }; Betrepo.Insert(_Bet); } }