Unknown Asp.net syntax
<p>Can some one explain the significance of the $ in the following line of aspnet code?  Not sure what to look for since I've never seen the syntax but FormView2 is the name of the formview this input sits inside. </p>

<p>Why is this necessary (if it is at all)?</p>

<pre><code>&lt;pre&gt;
    &lt;code&gt;
    &lt;!---test--&gt;
    &lt;input type="text" class="grid_2" id="FormView2_TextBoxName" value="0" name="FormView2$TextBox4"&gt;
    &lt;blockquote&gt;
    &lt;/pre&gt;
&lt;/code&gt;
</code></pre>
