what is the extern key word and used in C#
<blockquote>
  <p><strong>Possible Duplicate:</strong><br>
  <a href="http://stackoverflow.com/questions/5110706/how-does-extern-work-in-c">How does extern work in C#?</a>  </p>
</blockquote>



<p>Please tell me what is extern keyword and where we will use extern key word in C#.</p>
