如何通过一个图表C#将2个或多个数据序列分组

using System;
using System.Windows.Forms;
using System.Windows.Forms.DataVisualization.Charting;

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

        private void Form1_Load(object sender, EventArgs e)
        {
            // 创建一个图表控件
            Chart chart = new Chart();
            chart.Dock = DockStyle.Fill;

            // 创建一个图表区域
            ChartArea chartArea = new ChartArea();
            chart.ChartAreas.Add(chartArea);

            // 创建一个序列1
            Series series1 = new Series();
            series1.ChartType = SeriesChartType.Line;
            series1.Name = "Series 1";
            series1.Points.AddXY(1, 10);
            series1.Points.AddXY(2, 20);
            series1.Points.AddXY(3, 30);
            chart.Series.Add(series1);

            // 创建一个序列2
            Series series2 = new Series();
            series2.ChartType = SeriesChartType.Line;
            series2.Name = "Series 2";
            series2.Points.AddXY(1, 5);
            series2.Points.AddXY(2, 15);
            series2.Points.AddXY(3, 25);
            chart.Series.Add(series2);

            // 将图表控件添加到窗体上
            this.Controls.Add(chart);
        }
    }
}