title: Adding empty rows to a DataTable
body: <p>Is it possible to add a few rows to a DataTable with a single call?</p>
  
  <p>The issue is that I need to create a DataTable where each column requires a previous processing before being written into the DataTable. Writing row by row would be inconvenient.</p>
  
  <p>I.e., I need to create a DataTable with N empty rows and later write values in a column basis. </p>