Работа с классом: сериализация объекта - C#

SendDocumentResponse response1 = new SendDocumentResponse();
            response1.result.resultID = 1;
            response1.result.resultDescription = "ok";
            response1.envelopeId = 123654;
            response1.confirmReceipt.ReceiptId = "1";
            response1.confirmReceipt.ReceiptText = "frgthyjkjhgfg";
            response1.confirmReceipt.receiptSignature.signedElements = "ertrytjuk";
            response1.confirmReceipt.receiptSignature.signatureType = "rgtfg";
            byte[] bytes = new byte[454215];
            response1.confirmReceipt.receiptSignature.signatureValue = bytes;
            response1.confirmReceipt.receiptSignature.signedPubicCertificate = bytes;
            response1.confirmReceipt.receiptSignature.signedDate = null;
            SoapFormatter formatter = new SoapFormatter();
            using (FileStream fs = new FileStream("out.xml", FileMode.OpenOrCreate))
            {
                formatter.Serialize(fs, response1);
                               
            }

public class SendDocumentResponse
    {
        //public SendDocumentResponse() { result = new Result(); }
        //{ _result = new Result(); }
 
        private Result _result;
        private long _envelopeId;
        private ConfirmReceipt _confirmReceipt;
        
        /// <value>Property <c>result</c> Ответ.</value>
        public Result result{
            get { return this._result; }
            set { this._result = value; }
        }
 
        /// <value>Property <c>envelopeId</c>Номер зарегистрированного документа в Интеграционном шлюзе
        /// (по этому номеру необходимо выполнять запрос по статусу и на получение докумена)</value>
        public long envelopeId
        {
            get { return this._envelopeId; }
            set { this._envelopeId = value; }
        }
 
        /// <value>Property <c>confirmReceipt</c> Рецепт ответа.</value>
        public ConfirmReceipt confirmReceipt
        {
            get { return this._confirmReceipt; }
            set { this._confirmReceipt = value; }
        }
    }

 public class Result
    {
        //public Result() { }
 
        private int resultIdC;
        private string resultDescriptionC;
 
        /// <value>Property <c>resultId</c> код возврата.</value>
        public int resultID
        {
            get { return this.resultIdC; }
            set { this.resultIdC = value; }
        }
        /// <value>Property <c>resultDescription</c> Описание ответа.</value>
        public string resultDescription
        {
            get { return this.resultDescriptionC; }
            set { this.resultDescriptionC = value; }
        }
    }