NServiceBus.CallbackResponseHelper.ConvertToReturnCode C# (CSharp) Method

        public static string ConvertToReturnCode(this object returnCode)
        {
            var statusType = returnCode.GetType();
            if (!statusType.IsIntOrEnum())
            {
                throw new ArgumentException("The status can only be an enum or an integer.", nameof(returnCode));
            }

            var result = returnCode.ToString();
            if (statusType.IsEnum())
            {
                result = Enum.Format(statusType, returnCode, "D");
            }

            return result;
        }