[Unity C#] Single Instance

When there should be only one instance of this class in the whole game that shouldn’t be destroyed.

using UnityEngine;
using System.Collections;
using System.Collections.Generic;

public class CS_MessageBox : MonoBehaviour {

    private static CS_MessageBox instance = null;

    public static CS_MessageBox Instance {
        get { 
            return instance;

    void Awake () {
        if (instance != null && instance != this) {
        } else {
            instance = this;

    public void FunctionYouNeed () {
        Debug.Log("FunctionYouNeed is called :)");

To call this instance


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