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I have this tested code that works.
I am reading the serial port 'COM5' at 9600 Baud Rate, with successful results. The data on this port comes from an arduino board that is reading some other stuff on its I/O pins.
But some results are erroneous. So this is my question. How to eliminate the errors in this serial reading?
View :[^]

I have to do either a string trick or to find a specific function inside SerialPort method. Your advise is invaluable.
Thank you.

What I have tried:

using System;
using System.IO.Ports;

namespace ConsoleApplication1
    class ArduinoSerialReader
        static void Main(string[] args)
            SerialPort arduinoPort = new SerialPort("COM5", 9600); // Replace "COM3" with the appropriate port name

                arduinoPort.Open(); // Open the serial port
                arduinoPort.DataReceived += new SerialDataReceivedEventHandler(ArduinoPort_DataReceived); // Subscribe to the DataReceived event
                Console.WriteLine("Listening for Arduino data...");

                Console.ReadLine(); // Wait for user input to exit
                arduinoPort.Close(); // Close the serial port
            catch (Exception ex)
                Console.WriteLine("Error: " + ex.Message );

        static void ArduinoPort_DataReceived(object sender, SerialDataReceivedEventArgs e)
            SerialPort port = (SerialPort)sender;
            string receivedData = port.ReadExisting(); // Read the available data from the serial port

Updated 12-Jun-23 22:54pm
Graeme_Grant 11-Jun-23 9:03am    
In the old days we used a header + data + checksum with ACK (ok) & NAK (not ok) response handshaking.
0x01AA 11-Jun-23 10:23am    
Looks not like a mistake. Looks more, your PC reads then and when faster than arduino can send.

If you do a quick google search you can find samples to get you started: c# serial communication with arduino - Google Search[^]

Here are the first 2 results returned:
* C# Serial Port Communication Arduino : 4 Steps - Instructables[^]
* Control Arduino from C# Serial Port | C# Tutorials Blog[^]
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_Q12_ 11-Jun-23 9:18am    
In my OP, I put an image with the actual error in it.
Please look on that image to get the feel of the error I get.
Graeme_Grant 11-Jun-23 9:31am    
As mentioned above, if you want error handling, you need to add more to the data, like a checksum and handshaking. TCP/IP does this internally.
Graeme_Grant 11-Jun-23 9:40am    
This is a bit of a rs-232 comms primer for you: 3 Easy Steps to Understand and Control Your RS232 Devices[^]
I found the solution myself.
That particular error (from the image I posted) was because of this original method used:
string receivedData = port.ReadExisting();

By changing it into
string receivedData = port.ReadLine();

solved that particular 'error'/functionality.
Thats it, Thank you!
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