How to access the app.config value in the class library?
<p>I have a web application which is using a dll of a class library. I am unable to access the <code>app.config</code> value in the class library</p>

<p>How I'm trying to access <code>app.config</code>:</p>

<pre><code>ConfigurationSettings.AppSettings["conStr"].ToString();
</code></pre>

<p>this is returning a null value</p>

<p>Also when I try to use <code>ConfigurationManager</code> it says not found or missing assembly reference.</p>

<p>using System.Configuration is also added .</p>
