Unity EventSystem

Я использую один код для карточек, что снизу -

using UnityEngine;
using System.Collections;
using UnityEngine.EventSystems;
public class ChooseCard : MonoBehaviour, IPointerDownHandler, 
IPointerUpHandler
{
GameObject moveCard;
Slot slot;
GameObject book;
int id;
void Start()
{
    moveCard = GameObject.Find("SlotMouseCard");
    moveCard.transform.position = Vector2.zero;
    slot = GetComponent<Slot>();
    book = GameObject.Find("Book");
}
public void OnPointerDown (PointerEventData eventData) 
{
    if(slot.card != null)
    {
        moveCard.GetComponent<Slot>().card = slot.card;
        id = slot.card.id;
        slot.card = null;
        moveCard.gameObject.SetActive(true);
    }
}
public void OnPointerUp (PointerEventData eventData) 
{
    moveCard.transform.position = Vector2.zero;
    if(slot.card == null)
    {
        slot.card = moveCard.GetComponent<Slot>().card;
        moveCard.GetComponent<Slot>().card = null;
    }
    else if(slot.card != null)
    {
        book.GetComponent<Book>().collection[id] = null;
    }
    id = -1;
    moveCard.gameObject.SetActive(false);
}
}

И другой код для карточек сверху -

using System.Collections;
using UnityEngine;
using UnityEngine.EventSystems;
public class CardOfCollaction : MonoBehaviour, IPointerEnterHandler
{
GameObject moveCard;
Slot slot;
void Start()
{
    moveCard = GameObject.Find("SlotMouseCard");
    slot = GetComponent<Slot>();
}
public void OnPointerEnter (PointerEventData eventData) 
{
    if(moveCard.GetComponent<Slot>().card != null)
    {
        slot.card = moveCard.GetComponent<Slot>().card;
        moveCard.GetComponent<Slot>().card = null;
    }
}
}

И вот что выходит - Как мне пeредать значение верхним картам?