private void button1_Click(object sender, EventArgs e)
        {
            cct.Series.Clear(); //清掉原来的内容
            Series s = new Series("货品流水", ViewType.Line);//建一个名为货品流水的 折线

            cct.Series.Add(s);//加表chartControl中

            using (SqlConnection con = new SqlConnection("server =.;uid=sa;pwd=123;database=test"))
            {
                using (SqlDataAdapter ada = new SqlDataAdapter("select * from rdrecords where id =4", con))
                {

                    DataTable dt = new DataTable();
                    ada.Fill(dt);

                    SeriesPoint pt = null;//线上的一个点

                    foreach (DataRow dr in dt.Rows)
                    {
                        if (dr["invcode"] != null)
                        {
                            pt = new SeriesPoint(dr["invCode"].ToString()); //x轴值
                            
                            pt.Values = new double[] { Convert.ToDouble(dr["Quantity"])};//y轴值 接收数组
                            s.Points.Add(pt);
                        }
                    }
                }
            }
        }