Use invoke on a function with a parameter

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C#

InvokeCommandAction

I have a c# program where I put stuff in a richtextbox. I update it whenever the file is updated. Then I call a function to color the lines of the RTB. My issue is that I need to use Invoke on the colorTextbox() function but I can't figure out how to do it because it uses a parameter.
I have a similar thing for setupdatagrid() but it does not use a parameter.
Any help will be greatly appreciated.
Thanks

using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.Windows.Forms;
using System.Xml;
using System.IO;
using System.Security.Permissions;


namespace xml_reader
{
 
    public partial class Form1 : Form
    {
        string filename;
        public Form1()
        {
            InitializeComponent();
            setupdatagrid();

        }

        private void Form1_Load(object sender, EventArgs e)
        {
            richTextBox1.Multiline = true;
           // richTextBox1.AcceptsTab = true;
            richTextBox1.SelectionColor = Color.Red; 
            
            
        }

        private void btn_read_Click(object sender, EventArgs e)
        {
            OpenFileDialog openFileDialog1 = new OpenFileDialog();
            // Set filter options and filter index.
            openFileDialog1.Filter = "XML Files (*.xml)|*.xml";
            openFileDialog1.FilterIndex = 1;
            if (openFileDialog1.ShowDialog() == DialogResult.OK)
            {
                filename = openFileDialog1.FileName;
                readXML(openFileDialog1.FileName);
              
                FileSystemWatcher watcher = new FileSystemWatcher();
                string directoryName = Path.GetDirectoryName(openFileDialog1.FileName);
                watcher.Path = directoryName;
                watcher.NotifyFilter = NotifyFilters.LastAccess | NotifyFilters.LastWrite | NotifyFilters.FileName | NotifyFilters.DirectoryName;
                // Only watch xml files.
                watcher.Filter = "*.xml";

                // Add event handlers.
                watcher.Changed += new FileSystemEventHandler(OnChanged);
                watcher.Created += new FileSystemEventHandler(OnChanged);

                // Begin watching.
    //            timer1.Enabled = true;
                //  or
              watcher.EnableRaisingEvents = true;
                
            }  
        }

        private  void OnChanged(object source, FileSystemEventArgs e)
        {
            // Specify what is done when a file is changed, created, or deleted.
            string path = e.FullPath;
            Console.WriteLine("File: " + path + " " + e.ChangeType);
            System.Threading.Thread.Sleep(1000);
            readXML(path);
        }

        private void readXML(string Filename)
        {
          int linenumbers = 0;
          string stringvalue;
          string Pos = "POS";
          string Pilot = "PILOT";
          string laps = "LAPS";
          string elapsed = "ELAPSED";
          string seed = "SEED";
          string fast = "FAST LAP";
          string[] row;
          setupdatagrid();

          const string title = "POS           PILOT                 LAPS    ELAPSED      SEED         FAST LAP \n";
          StringBuilder builder = new StringBuilder(title, 1024); // 1k is a fair starting "guess" ;-)
          using (XmlTextReader reader = new XmlTextReader(Filename))
          {
            // The using statement ensures that reader is Closed when done.
            while (reader.Read())
            {
              switch (reader.NodeType)
              {
              case XmlNodeType.Element: // The node is an element.
                if (reader.Name == "Driver")
                {
                  while (reader.MoveToNextAttribute()) // Read the attributes.
                  {
                    stringvalue = reader.Value;
                    switch (reader.Name)
                    {
                    case "position":
                      builder.Append(" ").Append(stringvalue).Append("\t");
                      Pos = stringvalue;
                      break;
                    case "name":
                      string longname = stringvalue.PadRight(30);
                      Console.WriteLine("{0} {1}", longname, longname.Length);
                      builder.Append(longname);
                      Pilot = stringvalue;
                      break;
                    case "laps":
                      if (string.IsNullOrWhiteSpace(stringvalue))
                        stringvalue = "0";
                      builder.Append("  ").Append(stringvalue).Append("\t\t");
                      laps = stringvalue;
                      break;
                    case "seed":
                      if (string.IsNullOrWhiteSpace(stringvalue))
                        stringvalue = "0.000";
                      builder.Append(stringvalue).Append("\t\t");
                      seed = stringvalue;
                      break;
                    case "elapsedTime":
                      if (string.IsNullOrWhiteSpace(stringvalue))
                        stringvalue = "0.000";
                      builder.Append(" ").Append(stringvalue).Append("\t\t");
                      elapsed = stringvalue;
                      break;
                    case "fastLap":
                      if (string.IsNullOrWhiteSpace(stringvalue))
                        stringvalue = "0.000";
                      stringvalue = stringvalue.PadRight(8);
                      builder.Append(" ").AppendLine(stringvalue);
                      fast = stringvalue;
                      linenumbers++;
                      break;
                    default:
                      break;
                    }
                  }
                  row = new string[] { Pos, Pilot, laps, elapsed, seed, fast };
 //                 dataGridView1.Rows.Add(row);

                }
                break;
              case XmlNodeType.Text: //Display the text in each element.
                break;
              case XmlNodeType.EndElement: //Display the end of the element.
                break;
              }
            }
            reader.Close();
          }

          //          colorTextbox(linenumbers);

          Action updateText;
          updateText = () => richTextBox1.Text = builder.ToString();
          if (richTextBox1.InvokeRequired)
              richTextBox1.Invoke(updateText);
          else
              updateText();
            
  }



        
        private void colorTextbox(int lines)
        {
             if (this.InvokeRequired)
            {
              this.Invoke(new Action(() => colorTextbox()));// what is the correct Syntax?
            }
            else
            {

                int lineNumberToSelect = 0;
                int start = richTextBox1.GetFirstCharIndexFromLine(lineNumberToSelect);
                int length = richTextBox1.Lines[lineNumberToSelect].Length;
                richTextBox1.Select(start, length);
                richTextBox1.SelectionBackColor = Color.Red;
                for (int i = 1; i <= lines; i += 2)
                {
                    lineNumberToSelect = i;
                    start = richTextBox1.GetFirstCharIndexFromLine(i);
                    length = richTextBox1.Lines[i].Length;
                    richTextBox1.Select(start, length);
                    richTextBox1.SelectionBackColor = Color.Gray;

                    start = richTextBox1.GetFirstCharIndexFromLine(i + 1);
                    length = richTextBox1.Lines[i + 1].Length;
                    richTextBox1.Select(start, length);
                    richTextBox1.SelectionBackColor = Color.LightGray;
                }
                if (cb_DV.Checked == true)
                {
                    this.Width = richTextBox1.Width;
                    this.Height = richTextBox1.Height + dataGridView1.Height + 17;
                }
                else
                {
                    this.Width = richTextBox1.Width;
                    this.Height = richTextBox1.Height + 17;
                }
            }
        }

        private void setupdatagrid()
        {

            if (this.InvokeRequired)
            {
                this.Invoke(new Action(() => setupdatagrid()));
            }
            else
            {
                dataGridView1.Rows.Clear();
                dataGridView1.ColumnCount = 6;
                foreach (DataGridViewColumn c in dataGridView1.Columns)
                {
                    c.DefaultCellStyle.Font = new Font("Courrier New", 14F, FontStyle.Bold);
                }

                dataGridView1.Columns[0].Name = "POS";
                dataGridView1.Columns[1].Name = "PILOT";
                dataGridView1.Columns[2].Name = "LAPS";
                dataGridView1.Columns[3].Name = "ELAPSED";
                dataGridView1.Columns[4].Name = "SEED";
                dataGridView1.Columns[5].Name = "FAST LAP";
                dataGridView1.ColumnHeadersDefaultCellStyle.BackColor = Color.Red;
                dataGridView1.EnableHeadersVisualStyles = false;

                DataGridViewColumn column = dataGridView1.Columns[0];
                column.Width = 40;//POS
                column.DefaultCellStyle.Alignment = DataGridViewContentAlignment.MiddleCenter;
                column = dataGridView1.Columns[1];
                column.Width = 350;//PILOT
                column = dataGridView1.Columns[2];
                column.Width = 50;//laps
                column.DefaultCellStyle.Alignment = DataGridViewContentAlignment.MiddleCenter;
                column = dataGridView1.Columns[3];
                column.Width = 90;//elapsed
                column.DefaultCellStyle.Alignment = DataGridViewContentAlignment.MiddleCenter;
                column = dataGridView1.Columns[4];
                column.Width = 70;//seed
                column.DefaultCellStyle.Alignment = DataGridViewContentAlignment.MiddleCenter;
                column = dataGridView1.Columns[5];
                column.Width = 110;//fast
                column.DefaultCellStyle.Alignment = DataGridViewContentAlignment.MiddleCenter;
            }
        }

        private void btn_font_Click(object sender, EventArgs e)
              {
                  // Show the dialog.
                  FontDialog fontDialog1 = new FontDialog();
                  fontDialog1.Font = richTextBox1.Font;
                  fontDialog1.Color = richTextBox1.ForeColor;

                  if (fontDialog1.ShowDialog() != DialogResult.Cancel)
                  {
                      richTextBox1.Font = fontDialog1.Font;
                      richTextBox1.ForeColor = fontDialog1.Color;
                  }


              }

            private void btncolor_Click(object sender, EventArgs e)
            {
                ColorDialog colorDialog1 = new ColorDialog();

                // Set the initial color of the dialog to the current text color.
                colorDialog1.Color = richTextBox1.SelectionColor;

                // Determine if the user clicked OK in the dialog and that the color has changed.
                if (colorDialog1.ShowDialog() == System.Windows.Forms.DialogResult.OK &&
                   colorDialog1.Color != richTextBox1.SelectionColor)
                {
                    // Change the selection color to the user specified color.
                    richTextBox1.ForeColor = colorDialog1.Color;
                }
            }

            private void richTextBox1_ContentsResized(object sender, ContentsResizedEventArgs e)
            {
                richTextBox1.Height = e.NewRectangle.Height;
            }

            private void timer1_Tick(object sender, EventArgs e)
            {
                Console.WriteLine("timer tick");
                readXML(filename);
            }

              

    }
}

What I have tried:

various versions of the syntax