title: VS 2010 Express Edition Online registration!
body: <p>I am new to dotNET, I downloaded Visual Studio 2010 express edition free for 30 days, for practicing. After 30 days it say </p>
  
  <blockquote>
    <p>you need to register for continue using visual studio c sharp.</p>
  </blockquote>
  
  <p>After online registration it gave a Key, I entered the key and now Visual Studio continuing.</p>
  
  <p>What is that key for, and how long I use it? 
  I need to purchase a new one or I continue with this?</p>