title: Can NuGet edit a config file or only add to it?
body: <p>I've been working on a NuGet package for my company and one of the requirements is being able to update some of our config files.</p>
  
  <p>I know it's possible to add to a config file, but is it possible to edit one?</p>
  
  <p>Example:</p>
  
  <pre><code>&lt;add name="conn" connectionString="Data Source=.\;Initial Catalog=DB;Integrated Security=True" /&gt;
  </code></pre>
  
  <p>changes to below</p>
  
  <pre><code>&lt;add name="conn" connectionString="Data Source=.\;Initial Catalog=DB;User ID=ex;Password=example" /&gt;
  </code></pre>