Getting a unique number using Guid?

Any help with this error?
Assets\Scripts\CreatureStats.cs(13,34): error CS0119: 'Guid.NewGuid()' is a method, which is not valid in the given context

Am I missing a namespace or am I just using Guid wrong?

I am trying to get a unique number.

Code (CSharp):

1. using System.Collections;
2. using System.Collections.Generic;
3. using UnityEngine;
4.  
5. public class CreatureStats : MonoBehaviour
6. {
7.     public string CreatureID;
8.  
9.     void Start()
10.     {
11.         CreatureID = System.Guid.NewGuid.ToString();
12.         Debug.Log("CreatureID: " + CreatureID);
13.     }
14. }
15.  

 

figured it out:

CreatureID = System.Guid.NewGuid().ToString();