title: What is the default value of the nullable type "int?" (including question mark)?
body: <p>In C#, what is the default value of a class instance variable of type <code>int?</code>?</p>
  
  <p>For example, in the following code, what value will <code>MyNullableInt</code> have if it is never explicitly assigned?</p>
  
  <pre><code>class MyClass
  {
      public int? MyNullableInt;
  }
  </code></pre>
  
  <p>(It seems likely that the answer is almost certainly either <code>null</code> or <code>0</code>, but which of those is it?)</p>