error CS0119: 'Object.GetInstanceID()' is a method, which is not valid in the given context

Im trying to add a name to instantiated game object depending on its Id.
rest of the code is good as im folowing tutorial, just trying to add this one bit and for some reason i'm getting this error:
error CS0119: 'Object.GetInstanceID()' is a method, which is not valid in the given context

Code (CSharp):

1.    if(isFiring)
2.  
3.        
4.         {
5.             shotCounter -= Time.deltaTime;
6.             if(shotCounter <=0)
7.  
8.        
9.             {
10.                 shotCounter = timeBetwenShots;
11.                BulletController newBullet =  Instantiate(bullet, firePoint.position, firePoint.rotation) as BulletController;
12.            
13.                 newBullet.speed = bulletSpeed;
14.                [B] newBullet.name = newBullet.GetInstanceID.ToString();[/B]
15.             }
16.        
17.  
18.         }

How should i do it ?

 

newBullet.name = newBullet.GetInstanceID().ToString();
Notice the () after GetInstanceID.

 

That solved my problem , thank you.
Could you explain me these brackets? what are these doing really?

 

The parens are method invocation symbols. They're a basic construct of almost every modern language. I strongly suggest learning some basics of C# if you want to do game development with Unity.