How can i disable a function in C#

Questions & Answers
1

using UnityEngine;
using System.Collections;

public class PlayerEmptyRotate : MonoBehaviour {
	public float horizontalSpeed = 50.0F;
	// Use this for initialization
	void Start () {
	
	}
	
	// Update is called once per frame
	void Update () {
		if (!Input.GetKey (KeyCode.A) || !Input.GetKey (KeyCode.D) || !Input.GetKey (KeyCode.W) || !Input.GetKey (KeyCode.S)) 
		{
			float h = horizontalSpeed * Input.GetAxis ("Mouse X");
			transform.Rotate (0, h, 0);
		}
	}
}

The above is the code where I was trying to start the function in the if statement when those mentioned keys are not pressed and stop when any one of those keys is pressed.

2

just change || to &&

if (!Input.GetKey (KeyCode.A) && !Input.GetKey (KeyCode.D) && !Input.GetKey (KeyCode.W) && !Input.GetKey (KeyCode.S))