title: Using yield in C#
body: <p>I have a vague understanding of the <code>yield</code> keyword in <a href="/questions/tagged/c%23" class="post-tag" title="show questions tagged &#39;c#&#39;" rel="tag">c#</a>, but I haven't yet seen the need to use it in my code. This probably comes from a lack of understanding of it. </p>
  
  <p>So, what are some typical good usages of <code>yield</code>? </p>