title: How to fill a MemoryStream with 0xFF bytes?
body: <p>I have a <code>MemoryStream</code> which is created from a File at runtime.</p>
  
  <p>Then the <code>MemoryStream</code> is edited and some bytes are removed.</p>
  
  <p>Now I have to maintain a Constant Filesize so I have to fill the <code>MemoryStream</code> with 0xFF bytes..</p>
  
  <p>What is the Fastest way to Do this Operation?</p>
  
  <p>I know, that I always can loop through the <code>MemoryStream</code> sizes and add 0xFF's but I need to know a faster and more efficient way to do it!</p>