Disabling a drag and drop script

Hi. I am creating a game of battleship and cant get my battleships to disable their drag and drop feature when you click start

the following is my drag and drop script

using UnityEngine; using System.Collections;

[RequireComponent(typeof(BoxCollider2D))]

public class DragNDrop : MonoBehaviour {

 private Vector3 screenPoint;
 private Vector3 offset;

 public void OnMouseDown()
 {
     offset = gameObject.transform.position - Camera.main.ScreenToWorldPoint(new Vector3(Input.mousePosition.x, Input.mousePosition.y, screenPoint.z));
 }

 public void OnMouseDrag()
 {
     Vector3 curScreenPoint = new Vector3(Input.mousePosition.x, Input.mousePosition.y, screenPoint.z);
     Vector3 curPosition = Camera.main.ScreenToWorldPoint(curScreenPoint) + offset;
     transform.position = curPosition;
 }

}

the following is my disable script. It gets the boolean value of a button i already wrote the script for and created to determine whether or not it should disable the boat.

using UnityEngine; using System.Collections; using UnityEngine.UI;

public class Disable : MonoBehaviour {

 public DragNDrop DragNDrop;
 public Carrier Carrier;
 public Button startB;


 void Start()
 {
     DragNDrop = GetComponent<DragNDrop>();
     Carrier = GetComponent<Carrier>();
 }

 void Update()
 {
     if (startB.enabled == false)
     {
         DragNDrop.enabled = false;
         Carrier.enabled = false;
     }
     else
     {
         if (startB.enabled == true)
         {
             DragNDrop.enabled = true;
             Carrier.enabled = true;
         }
     }
 }
 

}

any help would be much appreciated. Thanks!

 startB.enabled == false