[C#]List List in C#

List<List<string>> myList = new List<List<string>>();

myList.Add(new List<string> { "a", "b" });
myList.Add(new List<string> { "c", "d", "e" });
myList.Add(new List<string> { "f", "g", "h","i" });



foreach (List<string> subList in myList)
{
    foreach (string item in subList)
    {
        Console.WriteLine(item);
    }
}

public class CustomerListList : List<CustomerList> { }  

public class CustomerList : List<Customer> { }

//class也可以變 List 真好用

public class Customer
{
   public int ID { get; set; }
   public string SomethingWithText { get; set; }
}

private List<List<int> > mylist = new List<List<int> >();

   List<int> sublist = new List<int>();
   sublist.Add(1);
   sublist.Add(2);

   mylist.Add(sublist);

   int a = mylist[0][1];// 則 a=2