手工添加数据到Chart

private void button1_Click(object sender, EventArgs e)
        {
            //清除Series
            chart1.Series.Clear();
            Random randon = new Random();

            //添加第一个Series
            chart1.Series.Add("2017年销售");
            chart1.Series[0].Points.Clear();
            chart1.Series[0].Points.AddXY("1月", randon.Next(50,500));
            chart1.Series[0].Points.AddXY("2月", randon.Next(50, 500));
            chart1.Series[0].Points.AddXY("3月", randon.Next(50, 500));
            chart1.Series[0].Points.AddXY("4月", randon.Next(50, 500));
            chart1.Series[0].Points.AddXY("5月", randon.Next(50, 500));
            chart1.Series[0].Points.AddXY("6月", randon.Next(50, 500));
            chart1.Series[0].Points.AddXY("7月", randon.Next(50, 500));
            chart1.Series[0].Points.AddXY("8月", randon.Next(50, 500));
            chart1.Series[0].Points.AddXY("9月", randon.Next(50, 500));
            chart1.Series[0].Points.AddXY("10月", randon.Next(50, 500));
            chart1.Series[0].Points.AddXY("11月", randon.Next(50, 500));
            chart1.Series[0].Points.AddXY("12月", randon.Next(50, 500));

            //添加第二个Series
            chart1.Series.Add("2018年销售");
            chart1.Series[1].Points.Clear();
            chart1.Series[1].Points.AddXY("1月", randon.Next(50, 500));
            chart1.Series[1].Points.AddXY("2月", randon.Next(50, 500));
            chart1.Series[1].Points.AddXY("3月", randon.Next(50, 500));
            chart1.Series[1].Points.AddXY("4月", randon.Next(50, 500));
            chart1.Series[1].Points.AddXY("5月", randon.Next(50, 500));
            chart1.Series[1].Points.AddXY("6月", randon.Next(50, 500));
            chart1.Series[1].Points.AddXY("7月", randon.Next(50, 500));
            chart1.Series[1].Points.AddXY("8月", randon.Next(50, 500));
            chart1.Series[1].Points.AddXY("9月", randon.Next(50, 500));
            chart1.Series[1].Points.AddXY("10月", randon.Next(50, 500));
            chart1.Series[1].Points.AddXY("11月", randon.Next(50, 500));
            chart1.Series[1].Points.AddXY("12月", randon.Next(50, 500));
        }