How do I access LinkedListNode.Item.Value within class derived from LinkedList

I have just started using the linked list class in an application and have derived my own class from it.  What I want to do is add a Write function in my derived list class that will iterate through all members of the list , cast them to another class and then call the write function.

I do NOT want to have to do this iteration in a class that contains a member variable of type MyLinkedList.  Doing this introduces the possibility of some member variables not being written correctly.  By implementing this funciton in MyLinkedList class, I can ensure that all MyLinkedLIst variables are written as expected and that all their list members are also written.

The problem I have is that in the MyLinkedList.Write function, I am unable to do any casting as it throws a compile error (obviously because <T> is unknown.  How can I achieve this functionality?

public class MyWritableClass
{
  ...
  public virtual void Write(BinaryWriter bw)
  {
    ...
  }
}

public class MyLinkedList<T> : LinkedList<T>
{

  ...

  public WriteBinary(BinaryWriter bw)
  {

   ...

    // We can safely assume that all items contained within this list are (or are derived from) MyWritableClass (above)
    for (ListNode<T> item = First; item != null; item = item.Next)
    {
      // This line does not compile due to the casting of item.Value from the unknown type <T>
      ((MyWritableClass)item.Value).Write(bw))

      // This line does not compile because items of type <T> fo not have a Write member function
      item.Value.Write(bw))
    }
  }
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