How to convert @script RequireComponent(AudioSource) to C#

I get the error "MissingComponentException: There is no 'AudioSource' attached .." How do I convert javascript's @script RequireComponent(AudioSource) to C#?

Thanks, Jeff

using UnityEngine;

[RequireComponent(typeof(AudioSource))]
[RequireComponent("AudioSource")] // Other way
public class MyScript : MonoBehaviour {
   // etc..

I read your comment and to add an `AudioSource` to your `GameObject` simply drag an Audio file onto the Object

http://unity3d.com/support/documentation/ScriptReference/RequireComponent.html