Problems when i click the button it has no sound in unity 3d c# help me guys this is for my thesis project

Questions & Answers
1

using UnityEngine;
using System.Collections;

public class MainMenu : MonoBehaviour {

private delegate void MenuDelegate();

public AudioClip click;
private float screenHeight;
private float screenWidth;
private float buttonHeight;
private float buttonWidth;
//Variables End
void Start ()
{
	screenHeight = Screen.height;
	screenWidth = Screen.width;
	
	buttonHeight = screenHeight * 0.1f;
	buttonWidth = screenWidth * 0.5f;
	
	//here we set the menuFunction to point to the anyKey function, which is further down in the code

}

void OnGUI () {
			// Make a background box
			//GUI.Box (new Rect (Screen.width / 2 - 190, 100, 100, 100), "Menu");
	
			// Make the first button. If it is pressed, Application.Loadlevel (Beta World) will be executed
			GUI.backgroundColor = Color.green;
	if(GUI.Button(new Rect((screenWidth - buttonWidth) * 0.5f, screenHeight * 0.4f, buttonWidth, buttonHeight), "Choose Mode"))
		
	{
					Application.LoadLevel ("gamemode");
					audio.PlayOneShot (click);
		
			}
	
			// Make the second button.
			GUI.backgroundColor = Color.yellow;
	if(GUI.Button(new Rect((screenWidth - buttonWidth) * 0.5f, screenHeight * 0.5f, buttonWidth, buttonHeight), "Instruction"))
		
	{
					Application.LoadLevel ("instruction");
					audio.PlayOneShot (click);
			}
	
			//Exit Game button
	GUI.backgroundColor = Color.blue;
	if(GUI.Button(new Rect((screenWidth - buttonWidth) * 0.5f, screenHeight * 0.6f, buttonWidth, buttonHeight), "Option"))
		
	{

					Application.LoadLevel ("option");
					audio.PlayOneShot (click);
			}
	
			//Options button, Use variables
			GUI.backgroundColor = Color.red;
	if(GUI.Button(new Rect((screenWidth - buttonWidth) * 0.5f, screenHeight * 0.7f, buttonWidth, buttonHeight), "Top Score"))

	{
					Application.LoadLevel ("score");
					audio.PlayOneShot (click);
			}
	}

}
2

You should play audio first, then load level. Reverse the sequence.

3

As @raptorkwok said, you must play the audio first.

You will need to wait for the end of the sound or play it from a persistent object. if you don’t, it will stop playing the sound as soon as the new scene is loaded.