protected void AddError(VerifyExchangeErrorCode error)
 {
     if ((errorCode.Contains(error)) || (error == VerifyExchangeErrorCode.OK)) return;
     errorCode.Add(error);
 }
 protected void AddError(VerifyExchangeErrorCode err)
 {
     switch (err)
     {
         case VerifyExchangeErrorCode.WrongFormat: bllErrorMsg.Items.Add(Message.UpdateDataFailed_WrongData); break;
         case VerifyExchangeErrorCode.CommentIsBlank: bllErrorMsg.Items.Add(litErrMsgCommentBlank.Text); break;
         default: break;
     }
 }