private static void AddBodyToContent(IMessage message, MultipartFormDataContent content)
        {
            var messageDataTransferObject = SendDataTransferObjectConverter.ToDataTransferObject(message);
            var xmlMessage = SerializeUtil.Serialize(messageDataTransferObject);

            var messageContent = new StringContent(xmlMessage);

            messageContent.Headers.ContentType        = new MediaTypeHeaderValue(DigipostVersion.V7);
            messageContent.Headers.ContentDisposition = new ContentDispositionHeaderValue("attachment")
            {
                FileName = "\"message\""
            };
            content.Add(messageContent);
        }
        protected override string Serialize(IRequestContent requestContent)
        {
            var messageDataTransferObject = SendDataTransferObjectConverter.ToDataTransferObject((Message)requestContent);

            return(SerializeUtil.Serialize(messageDataTransferObject));
        }