title: Difference between Readonly instance fields and Static readonly fields
body: <p>What are the difference between <code>Readonly instance fields</code> and <code>Static readonly fields</code> ? </p>
  
  <blockquote>
    <p>And how can we implement the <code>Static readonly fields</code> by <a href="http://msdn.microsoft.com/en-us/library/wxh6fsc7.aspx" rel="nofollow">Access Modifiers</a>? </p>
  </blockquote>