how to SceneManager.LoadScene(SceneManager.GetActiveScene().buildIndex); in unity 2020 code example

Example: unity scenemanager loadscene

using UnityEngine;
using UnityEngine.SceneManagement;

public class ExampleClass : MonoBehaviour
{
    void Start()
    {
        SceneManager.LoadScene("OtherSceneName", LoadSceneMode.Additive);
    }
}