title: Change escaped unicode to string in C#
body: <p>In c# I have</p>
  
  <pre><code>string x = @"\u0044\u0068\uD83D\uDE07\u90FD\u5728"
  </code></pre>
  
  <p>I need to turn it into:</p>
  
  <pre><code>Dh都在
  </code></pre>
  
  <p>How do I do that? Specifically, how do I know when \uD83D\uDE07 is one character as compared to two?</p>