Add New Node at the Start of Linked List in C#

To add new node or value at the start of LinkedList, the code is as follows −

Example

 Live Demo

using System;
using System.Collections.Generic;
public class Demo {
   public static void Main(){
      LinkedList<string> list = new LinkedList<string>();
      list.AddLast("A");
      list.AddLast("B");
      list.AddLast("C");
      list.AddLast("D");
      list.AddLast("E");
      list.AddLast("F");
      Console.WriteLine("Count of nodes = " + list.Count);
      Console.WriteLine("Elements in LinkedList...");
      foreach (string res in list){
         Console.WriteLine(res);
      }
      list.AddLast("G");
      list.AddLast("H");
      list.AddLast("I");
      Console.WriteLine("Count of nodes...UPDATED = " + list.Count);
      Console.WriteLine("Elements in LinkedList...UPDATED");
      foreach (string res in list){
         Console.WriteLine(res);
      }
      list.AddFirst("AA");
      Console.WriteLine("
We added a node in the beginning...");
      Console.WriteLine("Count of nodes...UPDATED = " + list.Count);
      Console.WriteLine("Elements in LinkedList...UPDATED");
      foreach (string res in list){
         Console.WriteLine(res);
      }
   }
}

Output

This will produce the following output−

Count of nodes = 6
Elements in LinkedList...
A
B
C
D
E
F
Count of nodes...UPDATED = 9
Elements in LinkedList...UPDATED
A
B
C
D
E
F
G
H
I 

We added a node in the beginning... Count of nodes...UPDATED = 10
Elements in LinkedList...UPDATED
AA
A
B
C
D
E
F
G
H
I

Example

Let us now see another example −

 Live Demo

using System;
using System.Collections.Generic;
public class Demo {
   public static void Main(){
      LinkedList<int> list = new LinkedList<int>();
      list.AddLast(100);
      list.AddLast(200);
      list.AddLast(300);
      list.AddLast(400);
      Console.WriteLine("Count of nodes = " + list.Count);
      Console.WriteLine("Elements in LinkedList...");
      foreach (int res in list){
         Console.WriteLine(res);
      }
      list.AddFirst(500);
      list.AddFirst(600);
      Console.WriteLine("
We added a node in the beginning...");
      Console.WriteLine("Count of nodes...UPDATED = " + list.Count);
      Console.WriteLine("Elements in LinkedList...UPDATED");
      foreach (int res in list){
         Console.WriteLine(res);
      }
   }
}

Output

This will produce the following output −

Count of nodes = 4
Elements in LinkedList...
100
200
300
400

We added a node in the beginning... Count of nodes...UPDATED = 6
Elements in LinkedList...UPDATED
600
500
100
200
300
400