PayPal.Invoice.Model.GenerateInvoiceNumberRequest.ToNVPString C# (CSharp) Method

        public string ToNVPString(string prefix)
        {
            StringBuilder sb = new StringBuilder();
            if (this.requestEnvelope != null)
            {
                    string newPrefix = prefix + "requestEnvelope" + ".";
                    sb.Append(this.requestEnvelopeField.ToNVPString(newPrefix));
            }
            return sb.ToString();
        }

        /// <summary>
        /// 
        /// </summary>
        ///<param name="generateInvoiceNumberRequest"></param>
        ///<param name="credential">An explicit ICredential object that you want to authenticate this call against</param> 
        public GenerateInvoiceNumberResponse GenerateInvoiceNumber(GenerateInvoiceNumberRequest generateInvoiceNumberRequest, ICredential credential)
        {
            IAPICallPreHandler apiCallPreHandler = new PlatformAPICallPreHandler(this.config, generateInvoiceNumberRequest.ToNVPString(string.Empty), ServiceName, "GenerateInvoiceNumber", credential);
               	 	((PlatformAPICallPreHandler) apiCallPreHandler).SDKName = SDKName;
            ((PlatformAPICallPreHandler) apiCallPreHandler).SDKVersion = SDKVersion;
            ((PlatformAPICallPreHandler) apiCallPreHandler).PortName = "Invoice";

            NVPUtil util = new NVPUtil();
            return GenerateInvoiceNumberResponse.CreateInstance(util.ParseNVPString(Call(apiCallPreHandler)), string.Empty, -1);
        }