Bootstrap drop down menu is not working

Please Check the following css and scripts are there in the header section of the page

<script type="text/javascript" src="Scripts/jquery-1.9.0.min.js"></script>
<link href="bootstrap/css/bootstrap.css" rel="Stylesheet" /> 	
<link href="bootstrap/css/bootstrap-theme.css" rel="Stylesheet" />
<script type="text/javascript" src="bootstrap/js/bootstrap.js"></script>

Use the following code:

</pre>
<div class="btn-group"><button class="btn btn-default dropdown-toggle" type="button" data-toggle="dropdown">
 Dropdown

 </button>
<ul class="dropdown-menu">
	<li><a href="#">Dropdown link</a></li>
	<li><a href="#">Dropdown link</a></li>
</ul>
</div>
<pre>

Reference taken from the following site.
http://getbootstrap.com/components/#dropdowns