/// <summary>
 /// Sets a flag indicating if a user has confirmed their contact info.
 /// </summary>
 /// <param name="confirmationRecord">Contains the date and time when the conformation has occurred.</param>
 public void SetConfirmed(
     ConfirmationOccurrence confirmationRecord)
 {
     if (ConfirmationRecord == null)
     {
         ConfirmationRecord = confirmationRecord;
     }
 }
 /// <summary>
 /// Remove the flag indicating if a user had confirmed their contact info.
 /// </summary>
 public void SetUnconfirmed()
 {
     ConfirmationRecord = null;
 }