title: App.config format and accessing data in .NET
body: <p>I'm new with editing app.config. I'd like to have this section in app.config:</p>
  
  <pre><code>&lt;name1&gt;
      &lt;name2&gt;
          &lt;name3 att="something1"&gt;value1&lt;/name3&gt;
          &lt;name3 att="something2"&gt;value2&lt;/name3&gt;
          ...
      &lt;/name2&gt;
  &lt;/name1&gt;
  </code></pre>
  
  <p>How to create it and access it from code? I want to get <code>something1</code>, <code>something2</code>, <code>value1</code> and <code>value2</code>.
  I found  <a href="https://www.codeproject.com/Articles/1173468/Four-Ways-to-Read-Configuration-Setting-in-Csharp" rel="nofollow noreferrer">this tutorial</a>, but it shows only how to get <code>something1</code>, not <code>something2</code>, <code>value1</code> and <code>value2</code> (Approach Four in tutorial).</p>
  
  <p>Thank you for any help.</p>