title: how to change color of a column in datagridview?
body: <p>I have a DataGridview, and I'm setting some of the columns to readonly for data entry purposes.  When I do that, the column stays the normal white (although it does not allow entry).  How can I color the column gray?  I've seen lots of samples on how to color rows, but not columns.</p>
  
  <p>How can I make the readonly columns look gray?</p>