how to disable a gameObject unity c#

public GameObject gameObj;//the gameobject you want to disable in the scene

        gameObj.SetActive(true); //set the object to active
        gameObj.SetActive(false);//set the object to disable

        gameObject.SetActive(true);//change the state of the current gameobject to active
        gameObject.SetActive(false);//change the state of the current gameobject to disable