title: Slow performance while setting some rows in bold in datagridview
body: <p>I'm trying to make some row in bold in a datagridview. This is applied when the binding of the datagridview is complete.</p>
  
  <pre><code>Font bold = new System.Drawing.Font(this.GridView.Font, FontStyle.Bold);
  
  foreach (DataGridViewRow row in this.GridView.Rows)
  {
      FlattenedResult item = row.DataBoundItem as FlattenedResult;
      if(item != null)
      {
          if(item.ParentID.Equals(item.ID))
          {
              row.DefaultCellStyle.Font = bold;
           }
       }
   }
  </code></pre>
  
  <p>The issue is that this operation takes more than 9 minutes (only for 1000 rows...). Is there a better way ?</p>
  
  <p>Thanks !</p>