c# winform chart(only for .net framework)

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 winformchart
{
    public partial class Form1 : Form
    {
        public Form1()
        {
            InitializeComponent();
        }
 
        private void chart1_Click(object sender, EventArgs e)
        {
 
        }
 
        private void button1_Click(object sender, EventArgs e)
        {
            chart1.Series["Series1"].Points.Clear();
            chart1.Series["Series1"].Points.Add(100);
            chart1.Series["Series1"].Points.Add(200);
            chart1.Series["Series1"].Points.Add(300);
            chart1.Series["Series1"].Points.Add(400);
 
        }
 
        private void button2_Click(object sender, EventArgs e)
        {
            chart2.Series["Series1"].Points.Clear();
            chart2.Series["Series1"].Points.AddXY(10,100);
            chart2.Series["Series1"].Points.AddXY(20,200);
            chart2.Series["Series1"].Points.AddXY(30,300);
            chart2.Series["Series1"].Points.AddXY(40,400);
            chart2.Series[0].ChartType = System.Windows.Forms.DataVisualization.Charting.SeriesChartType.SplineArea;
        }
        // binding for array/collection
        private void button3_Click(object sender, EventArgs e)
        {
            double[] scores = new double[] { 80, 90, 85, 70, 95 };
            chart1.Series[0].Points.DataBindY(scores);
 
            List<string> x = new List<string> { "철수", "영희", "길동", "재동", "민희" };
            List<double> y = new List<double> { 80, 95, 85, 70, 95 };
            chart2.Series[0].Points.DataBindXY(x, y);
 
            // data binding for object collections
            List<Worker> workers = new List<Worker>();
            workers.Add(new Worker("철수", 80));
            workers.Add(new Worker("영희", 90));
            workers.Add(new Worker("길동", 85));
 
            chart3.Series[0].Points.DataBind(workers, "Name", "Grade", null);
 
        }
    }
 
    class Worker
    { 
        public string Name { get; set; }
        public double Grade { get; set; }
        public Worker(string name, double Grade)
        {
            this.Name = name;
            this.Grade = Grade;
        }
    }
 
}