How would I make a ListChangedEvent?

 using System;
 using System.ComponentModel;
 
 public class InfoManager : MonoBehaviour
 {
     private event ListChangedEventHandler ListChanged(object sender, ListChangedEventArgs args)
     {
         //event code
     }
 }

So I gave it a shot, but the parentheses give the error, cannot specify constructor arguments in declaration. What did I do wrong? I'm a beginner, and haven't been able to figure this one out. Thanks in advance!