'Using SerialPort.Write(string) through DSharpPlus returns System.NullReferenceException. Literally what is wrong here?

I've been getting System.NullReferenceException whenever I tried sending a string called "woah" which has a value of "1" to a SerialPort.

I've been trying to turn on my LED light through that but it's just not working! I tried changing serialport settings or maybe directly sending "1" through it but it just doesn't work. The error is at

_serialPort.Write(woah)

Please help: Here's the code.

using System;
using System.Threading.Tasks;
using System.Threading;
using DSharpPlus;
using System.IO.Ports;

        namespace OngCorptHubert{class Program{
    
        static SerialPort _serialPort ;
            static void Main(string[] args)
            {
    
                MainAsync().GetAwaiter().GetResult();
            _serialPort = new SerialPort("COM4", 9600, Parity.None,8,StopBits.One);
            _serialPort.Open();
            }
    
    
    
        static async Task MainAsync()
        {
            var discord = new DiscordClient(new DiscordConfiguration()
            {
                Token = "nuh uh",
                TokenType = TokenType.Bot,
                Intents = DiscordIntents.AllUnprivileged
            });
            discord.MessageCreated += async (s, e) =>
            {
                if (e.Message.Content.ToLower().Contains("?led-ong"))
                {
                Console.WriteLine("Trying to send message to port.");
                    string woah = "1";
                    _serialPort.WriteLine(woah);
                    Console.WriteLine("Successful!");
                 await e.Message.RespondAsync("LED should be on");
                }
                
                
    
            };
            await discord.ConnectAsync();
            await Task.Delay(-1);
        }
        
    }
    }`
c++sharpstring


Solution 1:[1]

OH MY GOD I found the problem!! I don't know how but I think I just badly initialized the SerialPort. I removed static SerialPort _serialport; and removed _serialPort = new SerialPort("COM4", 9600, Parity.None,8,StopBits.One); _serialPort.Open(); And instead I added SerialPort _serialPort = new SerialPort("COM4", 9600, Parity.None, 8, StopBits.One); _serialPort.Open(); right before the writing command. My LED has turned on, I love programming.

Sources

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Source: Stack Overflow

Solution Source
Solution 1 Mittato

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