public JoinObjectParameter(List<string> objectname, List<DieuKienParameter> conname) { Joining = objectname[0]; JoinCondition = conname[0]; NumberOfItem = objectname.Count; for (int i = 1; i < objectname.Count; i++) { List<string> tmpobname = new List<string>(); List<DieuKienParameter> tmpcon = new List<DieuKienParameter>(); for (int j = i; j < objectname.Count; j++) { tmpobname.Add(objectname[j]); tmpcon.Add(conname[j]); } Joined = new JoinObjectParameter(tmpobname, tmpcon); } }