title: How to make a reference type from int
body: <p>i tried:</p>
  
  <pre><code>int i = 5;
  object o1 = i; // boxing the i into object (so it should be a reference type)
  object o2 = o1; // set object reference o2 to o1 (so o1 and o2 point to same place at the heap)
  
  o2 = 8; // put 8 to at the place at the heap where o2 points
  </code></pre>
  
  <p>after running this code, value in o1 is still 5, but i expected 8. </p>
  
  <p>Am I missing something?</p>