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LinkedList.AddFirst Method (Generic LinkedListNode)

Adds the specified new node at the start of the LinkedList.

Namespace: System.Collections.Generic
Assembly: System (in system.dll)

Public Sub AddFirst ( _
	node As LinkedListNode(Of T) _
Dim instance As LinkedList(Of T)
Dim node As LinkedListNode(Of T)

public void AddFirst (
	LinkedListNode<T> node
public function AddFirst (
	node : LinkedListNode<T>
Not applicable.



The new LinkedListNode to add at the start of the LinkedList.

Exception typeCondition


node is a null reference (Nothing in Visual Basic).


node belongs to another LinkedList.

LinkedList accepts a null reference (Nothing in Visual Basic) as a valid Value for reference types and allows duplicate values.

If the LinkedList is empty, the new node becomes the First and the Last.

This method is an O(1) operation.

The following code example and output demonstrate the AddFirst method. The code example removes the last node in a linked list of strings, adds a new node to the end of the list, marks that node, removes it, and finally uses the AddFirst(Generic LinkedListNode) method overload to insert the node at the beginning of the list.

This code and output are part of a larger example provided for the LinkedList class.

' Move the last node to be the first node.
mark1 = sentence.Last

Windows 98, Windows Server 2000 SP4, Windows CE, Windows Millennium Edition, Windows Mobile for Pocket PC, Windows Mobile for Smartphone, Windows Server 2003, Windows XP Media Center Edition, Windows XP Professional x64 Edition, Windows XP SP2, Windows XP Starter Edition

The Microsoft .NET Framework 3.0 is supported on Windows Vista, Microsoft Windows XP SP2, and Windows Server 2003 SP1.

.NET Framework

Supported in: 3.0, 2.0

.NET Compact Framework

Supported in: 2.0

XNA Framework

Supported in: 1.0