title: Number of columns in dataset
body: <p>Is it possible to find the number of columns a data set has?</p>
  
  <p>I know we can find the length of rows with:</p>
  
  <pre><code>ds.Tables[0].Rows.length
  </code></pre>
  
  <p>Is there something similar for counting or returning the length of the columns?</p>