title: VB.NET- Peformance when testing an empty string
body: <p>In VB6, I was told that when testing for an empty string, it would be much faster to check this by verifying the length of the string by using :</p>
  
  <pre><code>If Len("ABC") = 0 then 'fast
  </code></pre>
  
  <p>or</p>
  
  <pre><code>If LenB("ABC") = 0 then 'even faster
  </code></pre>
  
  <p>instead of:</p>
  
  <pre><code>If "ABC" = "" then 'slower
  </code></pre>
  
  <p>Do you know by any chance if this is true also in VB.NET? 
  Thank you.</p>