title: Auto Calculate datagridview
body: <p>How to auto calculate Column in datagridview?</p>
  
  <p>Something like in microsoft excel when you set a formula into a column. </p>
  
  <p>i have a date hired Column and a tenure column. the tenure Column should auto calculate with a <code>DateHired</code> - <code>DateToday</code> formula. </p>
  
  <p>please help. thank you.</p>