title: Add value to object type c#
body: <p>I've have object like this:</p>
  
  <pre><code>object rt = new {
      page = 1,
  };
  </code></pre>
  
  <p>Now how could I add new values to this object? I mean something like this:</p>
  
  <pre><code>rt += { code = 5 };
  </code></pre>
  
  <p>How it could be possible?</p>