static void Main(string[] args)
 {
     TwoDirectionList<int> mylist = new TwoDirectionList<int>();
     mylist.Add(1);
     mylist.Add(2);
     mylist.Add(3);
     foreach(var item in mylist)
     {
         Console.WriteLine(item);
     }
     Console.ReadLine();
 }
 public void TestMethodGet_Int_25()
 {
     TwoDirectionList<int> tdl = new TwoDirectionList<int>();
     tdl.Add(10);
     Assert.AreEqual(10, tdl.GetLast());
 }