PayPal.PayPalAPIInterfaceService.Model.CreateBillingAgreementReq.ToXMLString C# (CSharp) Method

        public string ToXMLString(string prefix, string name)
        {
            StringBuilder sb = new StringBuilder();
            if(name != null)
            {
                if(prefix != null)
                {
                    sb.Append("<").Append(prefix).Append(":").Append(name).Append(">");
                }
                else
                {
                    sb.Append("<").Append(PreferredPrefix).Append(":").Append(name).Append(">");
                }
            }
            if(CreateBillingAgreementRequest != null)
            {
                sb.Append(CreateBillingAgreementRequest.ToXMLString(null,"CreateBillingAgreementRequest"));
            }
            if (name != null)
            {
                if (prefix != null)
                {
                    sb.Append("</").Append(prefix).Append(":").Append(name).Append(">");
                }
                else
                {
                    sb.Append("</").Append(PreferredPrefix).Append(":").Append(name).Append(">");
                }
            }
            return sb.ToString();
        }

 /**
   *AUTO_GENERATED
  	  */
 public CreateBillingAgreementResponseType CreateBillingAgreement(CreateBillingAgreementReq createBillingAgreementReq, string apiUserName)
 {
     IAPICallPreHandler apiCallPreHandler = null;
      		string portName = "PayPalAPIAA";
     setStandardParams(createBillingAgreementReq.CreateBillingAgreementRequest);
     DefaultSOAPAPICallHandler defaultHandler = new DefaultSOAPAPICallHandler(createBillingAgreementReq.ToXMLString(null, "CreateBillingAgreementReq"), null, null);
     apiCallPreHandler = new MerchantAPICallPreHandler(defaultHandler, apiUserName, getAccessToken(), getAccessTokenSecret());
     ((MerchantAPICallPreHandler) apiCallPreHandler).SDKName = SDKName;
     ((MerchantAPICallPreHandler) apiCallPreHandler).SDKVersion = SDKVersion;
     ((MerchantAPICallPreHandler) apiCallPreHandler).PortName = portName;
     string response = Call(apiCallPreHandler);
     XmlDocument xmlDocument = new XmlDocument();
     xmlDocument.LoadXml(response);
     XmlNode xmlNode = xmlDocument.SelectSingleNode("*[local-name()='Envelope']/*[local-name()='Body']/*[local-name()='CreateBillingAgreementResponse']");
     return new CreateBillingAgreementResponseType(xmlNode);
 }