title: Crystal Report Sum of a Column data
body: <p>I have field GrandTotal in my dataset which I am showing in my report. I want show the total of all data in the footer .</p>
  
  <p>My column data are string .</p>
  
  <p>I tried to make a formula as bellow</p>
  
  <pre><code> SUM(ToNumber({Ds.Grandtotal}))
  </code></pre>
  
  <p>But its saying a field is require.</p>