System.indexoutofrangeexception: 'index was outside the bounds of the array.'

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;

namespace WindowsFormsApp12
{
    public partial class Form1 : Form
    {
        public Form1()
        {
            InitializeComponent();
        }

        private void BtnParseDisplay_Click(object sender, EventArgs e)
        {
            openFileDialog1.ShowDialog();

            txtFilePath.Text = openFileDialog1.FileName;
            BindDataCSV(txtFilePath.Text);
        }

        private void BindDataCSV(string filePath)
        {
            DataTable dt = new DataTable();
            string[] lines = System.IO.File.ReadAllLines(filePath);
            if (lines.Length > 0)
            {
                //first line to create header

                string firstLine = lines[0];

                string[] headerLabels = firstLine.Split(',');

                foreach(string headerWord in headerLabels)
                {
                    dt.Columns.Add(new DataColumn(headerWord));
                }

                //for data

            for(int r = 1; r < lines.Length; r++)
                {
                    string[] dataWords = lines[r].Split(',');
                    DataRow dr = dt.NewRow();
                    int columnIndex = 0;
                    foreach (string headerWord in headerLabels)
                    {

                        dr[headerWord] =  dataWords[columnIndex++];
                    }

                    dt.Rows.Add(dr);

                    }
            }

            if (dt.Rows.Count > 0)
            {
                dgvEmployees.DataSource = dt;
            }
        }
    }
}