making chart with datagridview

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DataGridView

DataTable

chart

I have a datagridview which user fill it. the result is calculated and return to read only columns of datagridview. I want to make a chart for two columns of my datagridview. but I don't save datagridview in a table because there is previous results in the table! somebody told me for creating chart you should save your datagridview to a table but in this case you should convert datagridview to datatable and then clear it! please tell me what should I do! :( this is my code for creating chart but it returns a empty chart!( I have 19 columns in my datagridview)

 using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Linq;
using System.Text;
using System.Windows.Forms;
using System.Windows.Forms.DataVisualization.Charting;



namespace finalproject
{
    public partial class Time_chart_Form : Form
    {
        private DataGridView DGV;
        public Time_chart_Form(DataGridView DGV)
        {
            InitializeComponent();
            this.DGV = DGV;
        }

        private void Time_chart_Form_Load(object sender, EventArgs e)
        {


            using (DataTable table = new DataTable("MyTable"))
            {

                DataRow newRow;

                table.Columns.Add(new DataColumn("Time", typeof(string)));

                table.Columns.Add(new DataColumn("Concentration", typeof(string)));



                int column;

                for (int i = 0; i < this.DGV.Rows.Count; i++)
                {

                    column = 0;

                    newRow = table.NewRow();

                    if (!this.DGV[column, i].FormattedValue.Equals(""))

                        newRow["Time"] = this.DGV[0, i].Value.ToString();

                    else

                        newRow["Time"] = null;

                    column = 16;

                    if (!this.DGV[16, i].FormattedValue.Equals(""))

                        newRow["Concentration"] = this.DGV[column, i].Value.ToString();

                    else

                        newRow["Concentration"] = null;

                    table.Rows.Add(newRow);

                }





                Chart chart = new Chart();



                chart.Width = 1600;
                chart.Height = 900;

                Series Series = new Series();
                Series.Name = "Series";

                Series.Color = Color.Red;

                Series.BorderColor = Color.FromArgb(255, 0, 0);
                Series.ChartType = SeriesChartType.Point;

                Series.BorderDashStyle = ChartDashStyle.Solid;
                //Series.BorderWidth = 10000;


                Series.ShadowColor = Color.FromArgb(128, 128, 128);
                Series.ShadowOffset = 0;

                Series.BorderColor = Color.FromArgb(0, 0, 0);



                //Chart Area-------------------------

                ChartArea ca1 = new ChartArea();
                ca1.Name = "ChartArea";
                ca1.BackColor = Color.White;
                ca1.BorderColor = Color.FromArgb(255, 255, 255);
                ca1.BorderWidth = 10;
                ca1.BorderDashStyle = ChartDashStyle.Solid;
                ca1.AxisX = new Axis();
                ca1.AxisY = new Axis();

                chart.BackColor = Color.FromArgb(255, 255, 255);
                chart.BackSecondaryColor = Color.White;
                chart.BackGradientStyle = GradientStyle.TopBottom;
                ca1.BackColor = System.Drawing.Color.FromArgb(64, System.Drawing.Color.White);

                chart.ChartAreas.Add(ca1);


                chart.Series.Add(Series);

                chart.Series["Series"].BorderWidth = 500;



                chart.Series["Series"].Points.DataBindXY(table.DefaultView, DGV.Columns[0].Name, table.DefaultView, DGV.Columns[16].Name);


                chart.ChartAreas[0].AxisY.Minimum = -6;
                chart.ChartAreas[0].AxisY.Maximum = 6;
                chart.ChartAreas[0].AxisX.Minimum = 0;
                chart.ChartAreas[0].AxisX.Maximum = 10;
                chart.ChartAreas[0].AxisX.Interval = 1;
                chart.ChartAreas[0].AxisY.Interval = 1;

                chart.Titles.Add(new Title("OverView Plot", Docking.Top, new Font("Verdana", 19.5f, FontStyle.Bold), Color.Black));


                chart.ChartAreas[0].AxisY.Title = "Time";
                chart.ChartAreas[0].AxisX.Title = "Concentration";

                chart.ChartAreas[0].AxisX.TitleFont = new System.Drawing.Font("Verdana", 19, FontStyle.Bold);
                chart.ChartAreas[0].AxisY.TitleFont = new System.Drawing.Font("Verdana", 19, FontStyle.Bold);


                chart.ChartAreas[0].AxisX.LabelStyle.Font = new System.Drawing.Font("Verdana", 19.25f, System.Drawing.FontStyle.Bold);
                chart.ChartAreas[0].AxisY.LabelStyle.Font = new System.Drawing.Font("Verdana", 19.25f, System.Drawing.FontStyle.Bold);





                chart.SaveImage(@"C:\Users\Maryam\Documents\Visual Studio 2010\prjchart" + (0).ToString() + ".png", ChartImageFormat.Png);

                //table.Clear();



            }
        }
        
        
    }

}