string myConnectionString = ReportForm.Properties.Settings.Default.CEC710ConnectionString;
            string mySelectQuery="SELECT vol_va,vol_vb,vol_vc,cur_ia,cur_ib,cur_ic,opertime FROM [AmmeterData103]";
            SqlConnection myConnection = new SqlConnection(myConnectionString);
            SqlCommand myCommand = new SqlCommand(mySelectQuery, myConnection); 
            // Set chart data source
            chart1.DataSource = myCommand;
            chart1.BorderlineWidth = 3;
            // Set series members names for the X and Y values 
            chart1.Series["A相电压"].XValueMember = "OperTime";
            chart1.Series["A相电压"].YValueMembers = "vol_va";

            chart1.Series["B相电压"].XValueMember = "OperTime";
            chart1.Series["B相电压"].YValueMembers = "vol_vb";

            chart1.Series["C相电压"].XValueMember = "OperTime";
            chart1.Series["C相电压"].YValueMembers = "vol_vc";

            chart1.Series["A相电流"].XValueMember = "OperTime";
            chart1.Series["A相电流"].YValueMembers = "cur_ia";

            chart1.Series["B相电流"].XValueMember = "OperTime";
            chart1.Series["B相电流"].YValueMembers = "cur_ib";

            chart1.Series["C相电流"].XValueMember = "OperTime";
            chart1.Series["C相电流"].YValueMembers = "cur_ic";

            // Data bind to the selected data source
            chart1.DataBind();

            foreach (Series s in chart1.Series)
            {
                s.ChartType = SeriesChartType.Spline;
            
            }