How do i create explosion,help[C#]?

Hi,I’m new in Uniy3d.I have got cubes(with rigidbody) and bomb object in my scene.How do i create explosion when bomb’s time is over.I try this but dont work.Link here.

And I need unity3d iphone c# tutorials.Can you help me?

-respects

Check out the framework Unity3D made.

yes i checked out but it’s so mixed.i need simple tutorial.

This video tutorial shows you how to make a simple explosion in Unity using a particle system.