title: Nested Partial Class
body: <pre><code>internal partial class Class1
  {
      private class Class2 : ISomething, ISomethingElse
      {
          private class Class3 : ISomething
          {
  
          }
      }
  }
  </code></pre>
  
  <p>I want <code>Class3</code> itself to host another private <code>Class4</code>, but that would make <code>Class3</code> too big so I want to make <code>Class3</code> partial. I know how to do that to a non-nested class. How would you make a nested class partial in a separate file?</p>