title: Center Justify paragraph in RichTextBox
body: <p>I use a RichTextBox, and I want to format all the lines in a paragraph with justify alignment, except the last line will be aligned to the center.  </p>
  
  <p>as this:</p>
  
  <pre><code>      sssssssssssssssssssssssss
        sssssssssssssssssssssssss
        sssssssssssssssssssssssss
             ssssssssssssss     
  </code></pre>
  
  <p>I use <a href="http://geekswithblogs.net/pvidler/archive/2003/10/14/182.aspx" rel="noreferrer">this code</a> for justify alignment.</p>