c#

    internal class Program
    {
        static void Main(string[] args)
        {
            var sp = new SerialPort();

            sp.DataReceived += Sp_DataReceived;
            sp.ErrorReceived += Sp_ErrorReceived;
        }

        private static void Sp_ErrorReceived(object sender, SerialErrorReceivedEventArgs e)
        {
            SerialPort sp = (SerialPort)sender;
            string indata = sp.ReadExisting();
            Console.WriteLine("Error Data Received:");
            Console.Write(indata);
        }

        private static void Sp_DataReceived(object sender, SerialDataReceivedEventArgs e)
        {
            SerialPort sp = (SerialPort)sender;
            string indata = sp.ReadExisting();
            Console.WriteLine("Data Received:");
            Console.Write(indata);
        }
    }

c#

    internal class Program
    {
        static void Main(string[] args)
        {
            var sp = new SerialPort();

            sp.DataReceived += Sp_DataReceived;
            sp.ErrorReceived += Sp_ErrorReceived;
        }

        private static void Sp_ErrorReceived(object sender, SerialErrorReceivedEventArgs e)
        {
            SerialPort sp = (SerialPort)sender;
            string indata = sp.ReadExisting();
            Console.WriteLine("Error Data Received:");
            Console.Write(indata);
        }

        private static void Sp_DataReceived(object sender, SerialDataReceivedEventArgs e)
        {
            SerialPort sp = (SerialPort)sender;
            string indata = sp.ReadExisting();
            Console.WriteLine("Data Received:");
            Console.Write(indata);
        }
    }