How to include reference to assembly in ASP.NET Core project
<p>I have this line </p>

<pre><code>string sConnectionString = ConfigurationManager.ConnectionStrings["Hangfire"].ConnectionString;
</code></pre>

<p>And it requires to include  <a href="https://msdn.microsoft.com/en-us/library/system.configuration.configurationmanager.connectionstrings(v=vs.110).aspx" rel="noreferrer">System.Configuration</a></p>

<p>In which place of the project I have to add reference to <code>System.Configuration</code> because I cannot find a classic place to do it under <code>References</code>?</p>

<p><a href="https://i.stack.imgur.com/pGdb8.png" rel="noreferrer"><img src="https://i.stack.imgur.com/pGdb8.png" alt="enter image description here"></a></p>