serial port in c#

I try to write this code for a serial interface but there are some errors that I don't know how to solve it.

The Code which I used is presented below:

using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Linq;
using System.Text;
using System.Windows.Forms;
using System.IO.Ports;

namespace serial_port
{
    public partial class Form1 : Form
    {
        public Form1()
        {
            InitializeComponent();
        }

        private void button1_Click(object sender, EventArgs e)
        {
            string[] ports = SerialPort.GetPortNames();
            foreach(string port in ports)
            {
                comboBox1.Items.Add(port);
            }
        }

        string t;
        private void button2_Click(object sender, EventArgs e)
        {
            
                t= comboBox1.Text.ToString();
            sErial(t);
        }

        void sErial(string Port_name)
        {
            SerialPort sp = new SerialPort(Port_name, 9600, Parity.None, 8, StopBits.One);
            sp.DataReceived += new SerialDataReceivedEventHandler(DataReceivedHandler);
            sp.Open();
        }
        private void ReceivedHandrler (object sender,SerialDataReceivedEventArgs e )
        {
            SerialPort sp = (SerialPort)sender;
            string w = sp.ReadLine();
            if(w != string.Empty)
            {
                invoke(new Action (()=>richTextbox1.AppendText(w) ));
            }

        }
    }
}

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Any idea what is going wrong ?
Tom3333Asked:
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käµfm³d 👽Commented:
What is/are the error(s)?
0
Tom3333Author Commented:
The errors are :

Error      1      The name 'DataReceivedHandler' does not exist in the current context      C:\Visual Studio Projects\serial_port\serial_port\Form1.cs      40      67      serial_port

Error      2      The name 'invoke' does not exist in the current context      C:\Visual Studio Projects\serial_port\serial_port\Form1.cs      49      17      serial_port

Error      3      The name 'richTextbox1' does not exist in the current context      C:\Visual Studio Projects\serial_port\serial_port\Form1.cs      49      40      serial_port
0
käµfm³d 👽Commented:
1) Change line 40 to:

sp.DataReceived += new SerialDataReceivedEventHandler(ReceivedHandrler);

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2) Change "invoke" to "Invoke" (uppercase i) in line 49.

3) You need to check that you actually have a RichTextBox control on your form, and its name should be richTextBox1.
0
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Tom3333Author Commented:
the first and second errors are fixed. About the third i have a RichTextBox on the form with the name richTextBox1.

Why is not recognized it?
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Tom3333Author Commented:
any suggestions?
0
Tom3333Author Commented:
any suggestions ?
0
käµfm³d 👽Commented:
If you type in:

this.rich

...within the editor, does Intellisense show the RTB?
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Tom3333Author Commented:
with the change "this.rich"  now can compile successfully the code.

When i tried to run the code , i receive the message bellow :
at the line :
sp.Open();

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UnauthorizedAccessException was unhandled
An unhandled exception of type 'System.UnauthorizedAccessException' occurred in System.dll

how to solve this problem ???
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Tom3333Author Commented:
any suggestions?
0
käµfm³d 👽Commented:
According to the documentation:

Access is denied to the port.
- or -
The current process, or another process on the system, already has the specified COM port open either by a SerialPort instance or in unmanaged code.

Check the permissions of the account you are running under, and then check to make sure that no other application has already opened that port. You may even try restarting Visual Studio just to make sure its not your own app locking it (from a previous run).
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