Moving 2D Sprite Player

So I managed to move my 2D Sprite Player with a joystick using C# code. The only problem is I want to make my player stop moving immediately after I am no longer touching the joystick. I know I could use angular drag and such to slowly stop the player, but it isn't instant. Any Ideas?

Here is my code that I used:

 using UnityEngine;
 using System.Collections;
 using UnityStandardAssets.CrossPlatformInput;
 
 public class FloatingPlayer2DController : MonoBehaviour {
 
     public float moveForce = 5;
     Rigidbody2D myBody;
 
     // Use this for initialization
     void Start ()
     {
         myBody = this.GetComponent<Rigidbody2D>();
     }
     
     // Update is called once per frame
     void FixedUpdate ()
     {
         Vector2 moveVec = new Vector2(CrossPlatformInputManager.GetAxis("Horizontal"), CrossPlatformInputManager.GetAxis("Vertical")) * moveForce;
 
         myBody.AddForce(moveVec);
     }
 }