title: how to check if string has consecutive characters in vb.net
body: <p>I'm trying to check if a string contains consecutive characters in vb.net</p>
  
  <p>Example:</p>
  
  <pre><code>'test@01' - not ok
  'test@02 - ok
  'testab' - not ok
  'testac' - ok
  'testabc' not ok
  </code></pre>
  
  <p>string should not have any consecutive characters. (both numbers &amp; alphabets) alphanumeric</p>
  
  <p>Any help is appreciated.</p>