An exmple of generics in c#

GenericsExample.cs

using System;
using System.Collections;
using System.Collections.Generic;

public interface IUseMagic
{
    void UseMagic();
}
public class MagicUser : IUseMagic
{
    private string userName;
    public MagicUser(string name){userName = name;}
    public void UseMagic(){Console.WriteLine(userName + " used magic");}
}
public class Node<T> where T : IUseMagic
{
   private Node<T> next;
   private T data;
   public Node(T t)
   {
       data = t;
   }
   public T GetData(){ return data; }
   public Node<T> GetNext(){ return next; }
   public void SetNext(Node<T> node){ next = node; }
}

class Program
{
    static void Main()
    {
        Node<MagicUser> k = new Node<MagicUser>(new MagicUser("Jackie Chaaan"));
        Node<MagicUser> k2 = new Node<MagicUser>(new MagicUser("Micheal Juksun"));
        Node<MagicUser> k3 = new Node<MagicUser>(new MagicUser("Hawri Pouteur"));
        Node<MagicUser> k4 = new Node<MagicUser>(new MagicUser("Fan Boi Chau"));
        
        k.SetNext(k2);
        k2.SetNext(k3);
        k3.SetNext(k4);
        
        Node<MagicUser> cur = k;
        while(cur != null)
        {
            cur.GetData().UseMagic();
            cur = cur.GetNext();
        }
        
    }
}