Doubly-Linked List (element)
This is much like inserting into a Singly-Linked List, but with added assignments so that the backwards-pointing links remain correct.

See also

 Array
 Associative array: Creation, Iteration
 Collections
 Compound data type
 Doubly-linked list: Definition, Element definition, Element insertion, List Traversal, Element Removal
 Linked list
 Queue: Definition, Usage
 Set
 Singly-linked list: Element definition, Element insertion, List Traversal, Element Removal
 Stack
static void InsertAfter(Link prev, int i)
{
    if (prev.next != null)
    {
        prev.next.prev = new Link() { item = i, prev = prev, next = prev.next };
        prev.next = prev.next.prev;
    }
    else
        prev.next = new Link() { item = i, prev = prev };
}