title: convert integer value to string and if it fails set "##" - SSRS
body: <p>I have below line in crystal report formula, It means that if string <code>conversion</code> failed it will print <code>##</code>.</p>
  
  <pre><code>CStr({rptReport;1.Total},"##")
  </code></pre>
  
  <p>Now, the question is how can I achieve this by <code>SSRS Expression</code>.</p>