C# create chart from datagridview from database

I'm trying create column chart from datagridview which downloads DataSet from database. Is datagridview 2. I've written in public class void loaddata(). As for as chart is concert i wrote by chart() public void class. I want display:

XvalueMember : ORDER_NUMBER
YvalueMember: TOTAL_TIME

There is my code:

GenerateCharts.cs

using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.Windows.Forms;
using MySql.Data.MySqlClient;
using System.Configuration;
using System.Windows.Forms.DataVisualization.Charting;
using iTextSharp.text;
using iTextSharp.text.pdf;
using System.IO;
using System.Text.RegularExpressions;

namespace ControlBase
{
    public partial class GenerateCharts : Form
    {
        public GenerateCharts()
        {
            InitializeComponent();
        }
        public void loaddata()
        {
            try
            {
                MySqlConnection connection = new MySqlConnection("datasource=localhost;port=3306;username=root;password=");
                MySqlDataAdapter adapter2 = new MySqlDataAdapter("SELECT w.FNAME, w.LNAME, z.ORDER_DESC AS 'ORDER DESCRIPTION', o.ORDER_NUMBER AS 'ORDER NUMBER', SEC_TO_TIME(SUM(TIME_TO_SEC(s.BEGIN_DATE) - TIME_TO_SEC(s.END_DATE))) AS 'TOTAL TIME OF ORDER' FROM projekt1.status_order s INNER JOIN projekt1.workers p ON s.ID_WORKER = w.ID_WORKER INNER JOIN projekt1.orders z ON s.ID_ORDER = o.ID_ORDER WHERE p.ID_WORKER ='" + int.Parse(textBox1.Text)+ "' AND BEGIN_DATE >= '" + dateTimePicker1.Value.ToString("yyyy-MM-dd") + "' AND END_DATE <= '" + dateTimePicker2.Value.ToString("yyyy-MM-dd") + "' GROUP BY s.ID_ORDER;", connection);
                connection.Open();

                DataSet ds2 = new DataSet();
                adapter2.Fill(ds2, "status_order");
                dataGridView2.DataSource = ds2.Tables["status_order"];
                connection.Close();
            }
            catch (Exception ex)
            {
                MessageBox.Show(ex.Message);
            }
        }

        public void chart()
        {

            MySqlConnection connection = new MySqlConnection();
            connection.ConnectionString = "datasource=localhost;port=3306;username=root;password=";
            connection.Open();

            MySqlCommand cmd = connection.CreateCommand();
            cmd.CommandText = "SELECT w.FNAME, w.LNAME, z.ORDER_DESC AS 'ORDER DESCRIPTION', o.ORDER_NUMBER AS 'ORDER NUMBER', SEC_TO_TIME(SUM(TIME_TO_SEC(s.BEGIN_DATE) - TIME_TO_SEC(s.END_DATE))) AS 'TOTAL_TIME' FROM projekt1.status_order s INNER JOIN projekt1.workers p ON s.ID_WORKER = w.ID_WORKER INNER JOIN projekt1.orders z ON s.ID_ORDER = o.ID_ORDER WHERE p.ID_WORKER ='" + int.Parse(textBox1.Text)+ "' AND BEGIN_DATE >= '" + dateTimePicker1.Value.ToString("yyyy-MM-dd") + "' AND END_DATE <= '" + dateTimePicker2.Value.ToString("yyyy-MM-dd") + "' GROUP BY s.ID_ORDER;";

            MySqlDataReader reader;

            reader = cmd.ExecuteReader();
            while (reader.Read())
            {
                chart1.Series[0].Points.AddXY(reader.GetString("ORDER_NUMBER"), reader.GetDateTime("TOTAL_TIME"));
            }

        }
        private void button1_Click(object sender, EventArgs e)
        {
            chart1.Series.Clear();
            chart();
            loaddata();

        }
    }
}

After launching this app and trying to generate a column i have error:

System.ArgumentOutOfRangeException: "The index was out of range. It must have a non-negative value and less than the size of the collection. Parameter name: index " 

I've tried by getting data from datagridview2 too but it haven't worked. Can someone explain how to change that code? Thx for any help.