title: special character (@) in data string producing error in dataview rowfilter
body: <p>I have a data table loaded with data. A column contains the string value "Insurance @ 4_25%". </p>
  
  <p>Creating a dataview rowfilter as:</p>
  
  <pre><code>    Property Expense as string = "Insurance @ 4_25%"        
      dv.rowfilter = "Expense = " &amp; Expense
  </code></pre>
  
  <p>I get the error "SyntaxErrorException was unhandled. Cannot interpret token '@' at position 21."</p>
  
  <p>When I apply the data value to the property I use the .toString. This column also does not contain any string delimiters.</p>
  
  <p>Any ideas?</p>