title: Explanation of int? vs int
body: <blockquote>
    <p><strong>Possible Duplicate:</strong><br>
    <a href="https://stackoverflow.com/questions/121680/whats-the-difference-between-int-and-int-in-c">What&#39;s the difference between &#39;int?&#39; and &#39;int&#39; in C#?</a>  </p>
  </blockquote>
  
  
  
  <p>I've come across some code in C# that declares a variable as: <code>int? number</code></p>
  
  <p>What does the <code>?</code> mean and how does this differ from just: <code>int</code></p>