C# MODBUS RTU for REGISTER READING

I am currently in the process of writing a c# program in VS where it reads the holding registers of a Panasonic KW9M-A Power Meter using Modbus-RTU. The holding register i'm trying to read is: 00A4H to 00A5H; Unsigned 32bit

Note: I wrote this in Console app. I used NModbus4 by Maxwe11 Idk what i'm missing since i'm a beginner in programming. Can someone please assist me? Thank you in advance :)

Here is what i have so far:

using System;
using System.Collections.Generic;
using System.IO.Ports;
using System.Linq;
using System.Text;
using System.Threading.Tasks;

namespace Console_ye
{
    class Program
    {

        public static void Main(string[] args)
        {
            SerialPort serialPort = new SerialPort("COM13", 115200, Parity.Odd, 8, StopBits.One);
            serialPort.Open();

            Console.WriteLine("This is the beginning: ");

            string hex_add = "0x00A4";
            ushort dec_add = Convert.ToUInt16(hex_add, 16);

            Console.WriteLine("Value of hex: " + hex_add);
            Console.WriteLine("Value of ushort: " + dec_add);

            byte slaveId = 1;
            ushort startAddress = dec_add;
            ushort numberOfPoints = 8;
            IModbusMaster masterRTU = ModbusSerialMaster.CreateRtu (serialPort);
            ushort[] ushortArray = masterRTU.ReadHoldingRegisters(slaveId, startAddress, numberOfPoints);

            Console.WriteLine("Here " + ushortArray[0]);
            foreach (ushort item in ushortArray)
            {
                Console.WriteLine(string.Join ("\n", item));
            }
        }
    }
}