unity deactivate inputfield

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

public class GamepadInputFieldHelper : MonoBehaviour {

    InputField _inputField;


    // Use this for initialization
    void Start () {
        _inputField = GetComponent<InputField>();
    }

    // Update is called once per frame
    void Update () {
        if(Input.GetButtonUp("Submit"))
        {
            _inputField.DeactivateInputField();
        }
    }
}