__doPostBack method
<p>I want to know why we use <code>__doPostBack</code> methods. Is it a build-in JavaScript method or a user defined function and what does this code do? </p>

<pre><code>onclick="javascript:setTimeout('__doPostBack(\'SectionA$1\',\'\')', 0)
</code></pre>

<p>I am getting an error for this method:</p>

<blockquote>
  <p>object expected</p>
</blockquote>
