public void Mod(int inSt, TeC o)
        {
            inSt = 202;

            o.St  = "20";
            o.Num = 2;
        }
        public void Test()
        {
            var st  = 10;
            var obj = new TeC
            {
                Num = 10,
                St  = "23"
            };

            Mod(st, obj);
        }