public static string QldbWrite(QldbRequestModel QldbRequest)
        {
            WebRequest Request      = BuildRequest(QldbRequest, $"{QldbApiUri}/write");
            string     ResponseJson = GetResponseString(Request);

            return(ResponseJson);
        }
        static WebRequest BuildRequest(QldbRequestModel QldbRequest, string Uri)
        {
            WebRequest Request;

            Request = WebRequest.Create(Uri);
            string PostData = JsonConvert.SerializeObject(QldbRequest);

            byte[] Data = Encoding.UTF8.GetBytes(PostData);
            Request.Method        = "POST";
            Request.ContentType   = "application/json";
            Request.ContentLength = Data.Length;
            using (Stream stream = Request.GetRequestStream())
                stream.Write(Data, 0, Data.Length);
            return(Request);
        }