Problem with OnTriggerEnter

Hi , i have problem with OnTriggerEnter in my project i add two capsule in my project and i set capsule collider for them , i want to one of them move to other one position and when they collide each other both of them be destroyed , i use this code for destroy

     void OnTriggerEnter(Collider other)
     {
         Destroy(gameObject);
     }

but its not work ! i set isTrigger true can any one help me thanks