static void Adding2LinkedList() { var obj = new CareerCupQnA(); var one = new LinkedList <int>(); one.AddLast(1); one.AddLast(2); one.AddLast(3); one.AddLast(7); var sec = new LinkedList <int>(); sec.AddLast(2); sec.AddLast(9); obj.Adding2LinkedList(one.First, sec.First); }