title: When should one use nullable types in c#?
body: <p>I have been repeatedly asked the following questions in many interviews.... But still can't explain them with a simple example...</p>
  
  <ol>
  <li>What are nullable types in c#?</li>
  <li>When should one use nullable types in c#?</li>
  <li>Can you give a simple example?</li>
  </ol>
  
  <p>Any suggestions?</p>