Jquery Undo - preventdefault
<p>I have a some textboxes and a drop down. 
If the user does not have permission to modify them, I like to 
show a message and undo what they selected in teh case of a drop down 
or to undo what they types - in the case of a text box.</p>

<p>I tried the following for a drop down but did not work:</p>

<pre><code>    $('#ReasonDropDown').change(function () {

        if (permission == "False") {
            alert("You do not have permssion to make to modify this field.");
            event.preventDefault(); 
            return false;
        }
    });
</code></pre>

<p>It simply did not undo what I had selected. </p>
