How can i make the Condition the Button Should instantiate once.....

Unity Engine
1

Hi all
I am new bie to unity. I have a button. When the button is clicked the 10 buttons will be instantiate in the Grid.I have done it

public GameObject yourGridLayout;
    
     //Here i put on click but you need to put your method.
     void OnClick(){
    
     for(int i = 0; i < list.Count; i++){
    
      var buttonInstantiate = Instantiate(button);
      buttonInstantiate.text = list[i];
      buttonInstantiate.transform.gameObject.parent =   yourGridLayout.transform;
    
     }
    
     }

. I have a problem in this. if i have pressed button Each and every time the button is instantaiate once again. Once again the 10 button is created. So i have 20 buttons in the grid. Like that it is increasing.
i Have to avoid this.

How can i make the condition the instantiated button should created once. after that if i clicked the button should not instantiated.

how can i do it…

2 
bool beenDoneDat = false; // name it better :)

void OnClick()
{
if(beenDoneDat) return;

// do stuff
beenDoneDat = true;
}