Explosion .cs

using UnityEngine;
using System.Collections;

public class Explosion : MonoBehaviour
{
    public float Radius;
    public float Force;
    void Update ()
    {
        Collider[] hitColliders = Physics.OverlapSphere(transform.position, Radius);
        for(int i=0; i<hitColliders.Length; i++)
        {
            if(hitColliders[i].GetComponent<Wall>())
            {
                hitColliders[i].GetComponent<Wall>().Dead();
            }
            if(hitColliders[i].CompareTag("CanBeRigidbody"))
            {
                if(!hitColliders[i].rigidbody)
                {
                hitColliders[i].gameObject.AddComponent<Rigidbody>();
                }
                hitColliders[i].rigidbody.AddExplosionForce(Force, transform.position, Radius, 3.0F);
            }
        }
        Destroy(gameObject,0.2f);
    }
    void OnDrawGizmos()
    {
        Gizmos.color = Color.red;
        Gizmos.DrawWireSphere(transform.position,Radius);
    }
}