C# Chart 折线图 多条数据展示

private void btn_Click(object sender, EventArgs e)
{

        DBHelper db = new DBHelper();
        DataSet ds = db.GetDataList();
        this.dataGridView1.DataSource = ds.Tables[0];

        DataSet ds1 = db.GetResportLine();
        DataSet ds2 = db.GetResportLine2();
        DataSet ds3 = db.GetResportLine3();

        DataTable dt1 = ds1.Tables[0];
        DataTable dt2 = ds2.Tables[0];
        DataTable dt3 = ds3.Tables[0];
         
        //chart1.ChartAreas[0].AxisX.Maximum = 1000;//设定x轴的最大值
        //chart1.ChartAreas[0].AxisY.Maximum = 100;//设定y轴的最大值

        //chart1.ChartAreas[0].AxisX.Minimum = 1;//设定x轴的最小值
        //chart1.ChartAreas[0].AxisY.Minimum = 0;//设定y轴的最小值

        //第一条数据
        Series ss = new Series("dt1");   //这里 dt1 ,dt2 任意取名称，但要唯一
        ss.Points.DataBind(dt1.AsEnumerable(), "xzhou", "yzhou", "");
        ss.XValueType = ChartValueType.DateTime; //设置X轴
        ss.ChartType = SeriesChartType.Spline;   //设置Y轴为折线
        chart1.Series.Add(ss);

        //第二条数据
        Series ss2 = new Series("dt2");
        ss2.Points.DataBind(dt2.AsEnumerable(), "xzhou2", "yzhou2", "");
        ss2.XValueType = ChartValueType.DateTime; //设置X轴
        ss2.ChartType = SeriesChartType.Spline;   //设置Y轴为折线
        chart1.Series.Add(ss2);

        //第三条数据
        Series ss3 = new Series("dt3");
        ss3.Points.DataBind(dt3.AsEnumerable(), "xzhou2", "yzhou2", "");
        ss3.XValueType = ChartValueType.DateTime; //设置X轴
        ss3.ChartType = SeriesChartType.Spline;   //设置Y轴为折线
        chart1.Series.Add(ss3);
         
    }