unity button press onclick click add csharp

                
                        using UnityEngine;
using UnityEngine.UI;

public class Example : MonoBehaviour
{
	[SerializeField]
    private Button button;
    
    void Start()
    {
    	button.onClick.AddListener(RunThisTask);
    }
    
    void RunThisTask(){
    	//do something
    }
}