C#

//zedgraph
namespace WindowsApplication2
{
    public partial class Form1 : Form
    {
        string t;
        SerialPort sp;

Thread m_thread;
bool m_running = false;
ManualResetEvent m_event = new ManualResetEvent(true);
bool m_pause = false;
private GraphPane myPane;

public Form1()
{
    InitializeComponent();
    Control.CheckForIllegalCrossThreadCalls = false;
    // User can already search for ports when the constructor of the FORM1 is calling 
    // And let the user search ports again with a click
    // Searching for ports function

    SearchPorts();

    CreateZedGraph(); //error : Severity    Code    Description Project File    Line    Suppression State
                      //Error CS7036  There is no argument given that corresponds to the required formal parameter 
                      //'w' of 'Form1.DrawPoint(ZedGraphControl, int, PointPair)'
}
// start button
private void btnStart_Click(object sender, EventArgs e)
{
    if (m_thread == null || m_thread.IsAlive == false)
    {
        ClearGraph();
        m_thread = new Thread(Process);
        m_thread.Start();
    }
}
void Process()
{       
    PointPair point = new PointPair();
    btnStart.Enabled = false;
    btnStop.Enabled = true;
    m_running = true;
    while (m_running == true)
    {
        m_event.WaitOne();

        point.Y = Convert.ToDouble(serialPort1);
        point.X++;  //time instance of measurement??
        DrawPoint(zed1, point);
        ssData.Value = point.Y.ToString();
        RefresheZedGraphs(zed1);
        Thread.Sleep(700);
    }
    btnStart.Enabled = true;
}

private void CreateZedGraph(object sender, SerialDataReceivedEventArgs e, ZedGraphControl zgc)
{
    myPane = zgc.GraphPane;
    // axes stuff
    myPane.Title.Text = "FRDM-KW40z serial Test";
    myPane.XAxis.Title.Text = "Time";
    myPane.YAxis.Title.Text = "Voltage";
    myPane.XAxis.MajorGrid.IsVisible = true;
    myPane.YAxis.MajorGrid.IsVisible = true;
    myPane.XAxis.MinorGrid.IsVisible = true;
    myPane.YAxis.MinorGrid.IsVisible = true;

    // data from serial port

    PointPairList list = new PointPairList();
    zed1.GraphPane.AddCurve("Test", list, Color.Red);

}
//serial port data collection
private void button2_Click(object sender, EventArgs e)
    {
        comboBox1.Items.Clear();
        SearchPorts();
    }
    void SearchPorts()
    {
        string[] ports = SerialPort.GetPortNames();
        foreach (string port in ports)
        {
            comboBox1.Items.Add(port);
        }
    }

    private void button3_Click(object sender, EventArgs e)
    {
        // Catch exception if it will be thrown so the user will see it in a message box
        OpenCloseSerial();
    }      
    void OpenCloseSerial()
    {
        try
        {
            if (sp == null || sp.IsOpen == false)
            {
                t = comboBox1.Text.ToString();
                sErial(t);
                button3.Text = "Close Serial port"; // button text
            }
            else
            {
                sp.Close();
                button3.Text = "Connect and wait for inputs";   // button text

            }
        }
        catch (Exception err)   // catching error message
        {
            MessageBox.Show(err.Message);   // displaying error message
        }           
    }

    void sErial(string Port_name)
    {
        try
        {
            sp = new SerialPort(Port_name, 115200, Parity.None, 8, StopBits.One);   // serial port parameters
            sp.DataReceived += new SerialDataReceivedEventHandler(DataReceivedHandler);
            sp.Open();
        }
        catch (Exception err)
        {
            throw (new SystemException(err.Message));
        }
    }
private  void DataReceivedHandler(object sender,SerialDataReceivedEventArgs e)
    {

        // This below line is not need , sp is global (belongs to the class!!)
        //SerialPort sp = (SerialPort)sender;
        if (e.EventType == SerialData.Chars)
        {
            if (sp.IsOpen)
            {
                string w = sp.ReadExisting();
                if (w != String.Empty)
                {
                    Invoke(new Action(() => Control.Update(w)));
                }
            }
        }
    }

    private void comboBox1_SelectedIndexChanged(object sender, EventArgs e)
    {
        if (sp == null || sp.IsOpen == false)
        {
            OpenCloseSerial();
        }
    }

I found an Unexplainable behaviour of LINQ in a tutorial code example from this site:

How to: Populate Object Collections from Multiple Sources (LINQ) (C#)
https://docs.microsoft.com/en-us/dotnet/articles/csharp/programming-guide/concepts/linq/how-to-populate-object-collections-from-multiple-sources-linq

How to: Join Content from   
        // Dissimilar Files (LINQ).  

names.csv
-----------------------------------
Omelchenko,Svetlana,111  
O'Donnell,Claire,112  
Mortensen,Sven,113  
Garcia,Cesar,114  
Garcia,Debra,115  
Fakhouri,Fadi,116  
Feng,Hanying,117  
Garcia,Hugo,118  
Tucker,Lance,119  
Adams,Terry,120  
Zabokritski,Eugene,121  
Tucker,Michael,122  

scores.csv
-----------------------------------
111, 97, 92, 81, 60  
112, 75, 84, 91, 39  
113, 88, 94, 65, 91  
114, 97, 89, 85, 82  
115, 35, 72, 91, 70  
116, 99, 86, 90, 94  
117, 93, 92, 80, 87  
118, 92, 90, 83, 78  
119, 68, 79, 88, 92  
120, 99, 82, 81, 79  
121, 96, 85, 91, 60  
122, 94, 92, 91, 91   

Code:

class Student  
{  
    public string FirstName { get; set; }  
    public string LastName { get; set; }  
    public int ID { get; set; }  
    public List<int> ExamScores { get; set; }  
}


//…

public static void Main()  
{
 
 	 
 	 string filepathname = @"C:\LINQPad\";  
	 string[] names = System.IO.File.ReadAllLines(filepathname + "names.csv");  
 
	 string[] scores = System.IO.File.ReadAllLines(filepathname + "scores.csv");       

        IEnumerable<Student> queryNamesScores =  
            from nameLine in names  
            let splitName = nameLine.Split(',')  
            from scoreLine in scores  
            let splitScoreLine = scoreLine.Split(',')  
            where splitName[2] == splitScoreLine[0]  // no match??			
            select new Student()  
            {  
                FirstName = splitName[0],  
                LastName = splitName[1],  
                ID = Convert.ToInt32(splitName[2]),  
                ExamScores = (from scoreAsText in splitScoreLine.Skip(1)  
                              select Convert.ToInt32(scoreAsText)).  
                              ToList()  
            };         
  
        List<Student> students = queryNamesScores.ToList();  

        // Display each student's name and exam score average.  
        foreach (var student in students)  
        {  
            Console.WriteLine("The average score of {0} {1} is {2}.",  
                student.FirstName, student.LastName,  
                student.ExamScores.Average());  
        } 
 
 }

 Expected Output:   
    The average score of Omelchenko Svetlana is 82.5.  
    The average score of O'Donnell Claire is 72.25.  
    The average score of Mortensen Sven is 84.5.  
    The average score of Garcia Cesar is 88.25.  
    The average score of Garcia Debra is 67.  
    The average score of Fakhouri Fadi is 92.25.  
    The average score of Feng Hanying is 88.  
    The average score of Garcia Hugo is 85.75.  
    The average score of Tucker Lance is 81.75.  
    The average score of Adams Terry is 85.25.  
    The average score of Zabokritski Eugene is 83.  
    The average score of Tucker Michael is 92.  
*/

* Real Output:  
    … nothing ….
*/

Why does LINQ not match correctly 
At this point of code:

where splitName[2] == splitScoreLine[0]  // no match??		

And therefore no output will be generated

Thanks for advice

Alberto