Retrieve value from web.config system.web section
<p>In my .net application <code>web.config</code> file, under the system.web section,</p>

<pre><code>&lt;system.web&gt;
     &lt;membership configSource="membership.config" /&gt;
&lt;/system.web&gt;
</code></pre>

<p>and in my membership.config file:</p>

<pre><code>&lt;?xml version="1.0" encoding="utf-8"?&gt;
&lt;membership defaultProvider="MembershipProvider"&gt;
    &lt;add applicationName="xxx"  
         testing="3" /&gt;
 &lt;/providers&gt;
&lt;/membership&gt;
</code></pre>

<p>In my application code, how do I get the value for "testing"?</p>
