title: Cast object to decimal? (nullable decimal)
body: <p>If have this in the setter of a property:</p>
  
  <pre><code>decimal? temp = value as decimal?;
  </code></pre>
  
  <p>value = "90"</p>
  
  <p>But after the cast, temp is <strong>null</strong>...</p>
  
  <p>What is the proper way to do this cast?</p>