onClick event not working on appendChild method

Ive written the script below, I dont understand why clicking on the button doesnt call the message function.
<script type="text/javascript">
var numbers= 0;
function addfield() {
var newButton= document.createElement("input");
newButton.ID= "button"+numbers;
newButton.value= "button"+numbers;
newButton.onClick= "message()";
var increment= ++numbers;
numbers= increment;
function message() {
alert("Hello There!!!");
<a href="#" onClick="addfield()" >add</a>
<div id="placeholder">

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Ryan ChongBusiness Systems Analyst , ex-Senior Application EngineerCommented:
quick guess, try change:

<a href="#" onClick="addfield()" >add</a>


<a href="#" onClick="addfield();return false;" >add</a>

Use the following on line 11 of your code:
newButton.onclick= message;

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If you want multiple statements to run in an onclick event, you can try
newButton.onclick= function(){message();dosomething();};

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