Make sure read-only DetailsView fields get passed to database

protected void DetailsView1_ItemUpdating(object sender, System.Web.UI.WebControls.DetailsViewUpdateEventArgs e)
{
 //Making a DetailsView field read only will prevent the user from changing it.
 //This code will make sure that any such fields get passed during the database update.
 foreach (DataControlField DetailsViewDataControlField in sender.Fields) {
  if (DetailsViewDataControlField is BoundField) {
   BoundField DetailsViewBoundField = DetailsViewDataControlField;
   string FieldName = DetailsViewBoundField.DataField;
   if (DetailsViewBoundField.ReadOnly == true) {
    e.NewValues.Item(FieldName) = e.OldValues.Item(FieldName);
   }
  }
 }
}