JQuery Calendar control only appears once when clicking on textbox
<p>I have a JQuery calendar which works perfectly on my webpage but only once. After i select the date and i try to click on the textbox  to change the date the calendar doesn't appear.</p>

<p>here is my code 
` </p>

<pre><code>    $(document).ready(function () {           
        $("#&lt;%= txtDatePicker.ClientID %&gt;").datepicker();           
    });
</code></pre>

<p>`</p>

<pre><code>&lt;asp:TextBox ID="txtDatePicker" runat="server" OnTextChanged="txtDatePicker_TextChanged" AutoPostBack="True" &gt;&lt;/asp:TextBox&gt;
</code></pre>
