how to get dateTimePicker value

int monthIndex = dateTimePicker1.Value.Month;

        private string myAreaName(int i)
        {
            if (i == 1) return "January";
            else if (i == 2) return "February";
            else if (i == 3) return "March";
            else if (i == 4) return "April";
            else if (i == 5) return "May";
            else if (i == 6) return "June";
            else if (i == 7) return "July";
            else if (i == 8) return "August";
            else if (i == 9) return "September";
            else if (i == 10) return "October";
            else if (i == 11) return "November";
            else return "December";
        }

private void makeChart()
        {
            string year = dateTimePicker1.Value.Year.ToString().Trim();
            monthIndex = dateTimePicker1.Value.Month;
            ChartArea chartArea2 = new System.Windows.Forms.DataVisualization.Charting.ChartArea();
            chartArea2.Name = myAreaName(monthIndex);

            List<string> ls = new List<string>();

            foreach (string drv in checkedListBox1.CheckedItems)
            {
                ls.Add(drv.Trim());
            }

            Ship = ls.ToArray();

            chart1.Series.Clear();
            chart1.Titles.Clear();
            chart1.ChartAreas.Clear();

            chart1.ChartAreas.Add(myAreaName(monthIndex));
            chart1.Titles.Add(myAreaName(monthIndex));
            chart1.Titles["Title1"].Name = myAreaName(monthIndex);
            chart1.Titles[myAreaName(monthIndex)].Text = myAreaName(monthIndex) + " " + dateTimePicker1.Value.Year;
            chart1.Titles[myAreaName(monthIndex)].DockedToChartArea = myAreaName(monthIndex);
            chart1.Titles[myAreaName(monthIndex)].IsDockedInsideChartArea = false;
            chart1.Titles[myAreaName(monthIndex)].Docking = System.Windows.Forms.DataVisualization.Charting.Docking.Top;
            chart1.Titles[myAreaName(monthIndex)].DockingOffset = 0;
            chart1.Titles[myAreaName(monthIndex)].BackColor = Color.SeaShell;

            foreach (string row in Ship)
            {
                System.Windows.Forms.DataVisualization.Charting.Series AnnualSeries = new System.Windows.Forms.DataVisualization.Charting.Series();
                Ship_id = row.Substring(0, row.IndexOf(" "));
                Ship_name = row.Substring(row.IndexOf(" ") + 1, row.Length - 1 - row.IndexOf(" "));
                SeriesName = Ship_name;// +" " + monthIndex.ToString();
                AnnualSeries.Name = SeriesName;
                AnnualSeries.ChartArea = myAreaName(monthIndex);
                chart1.Series.Add(AnnualSeries);
                AnnualSeries.IsValueShownAsLabel = true;
                chart1.Series[SeriesName].ChartType = System.Windows.Forms.DataVisualization.Charting.SeriesChartType.Spline;
                chart1.ChartAreas[0].AxisX.IntervalType = DateTimeIntervalType.Days;
                chart1.Series[SeriesName].MarkerSize = 10;
                chart1.Series[SeriesName].MarkerStyle = myMarkerStyle(chart1.Series.IndexOf(SeriesName));
                chart1.Series[SeriesName].EmptyPointStyle.IsValueShownAsLabel = false;
                chart1.Series[SeriesName].EmptyPointStyle.MarkerSize = 1;
                chart1.Series[SeriesName].Color = mySeriesColor(Ship_id);
            }

            SqlConnection sqlbA = new SqlConnection(connectionString);
            sqlbA.Open();
            SqlDataAdapter dabA = new SqlDataAdapter();
            DataSet dsbA = new DataSet();

            foreach (string row in Ship)
            {
                Ship_id = row.Substring(0, row.IndexOf(" "));
                Ship_name = row.Substring(row.IndexOf(" ") + 1, row.Length - 1 - row.IndexOf(" "));
                SeriesName = Ship_name;// + " " + monthIndex.ToString();
                int DaysInMonth = DateTime.DaysInMonth(Convert.ToInt16(year), monthIndex);

                dabA.SelectCommand = new SqlCommand(
                 "SELECT ship_id, [dayOfMonth_a] AS s_day, [avg_cons] AS AVG_cons FROM dbo.[dayAvgCons] " +
                 "WHERE ( ship_id = " + Ship_id +
                 " AND [avg_cons] != 0 " +
                 " AND [month_a] = " + monthIndex.ToString() +
                 " AND [year_a] = " + year +
                 ") ORDER BY s_day"
                  , sqlbA);
                dsbA.Clear();
                dabA.Fill(dsbA, "AVG");
                //AcurrSeries = SeriesName;
                foreach (DataRow rowc in dsbA.Tables["AVG"].Rows)
                {
                    if (Convert.ToInt16(rowc["AVG_cons"]) > 60)
                    {
                        chart1.Series[SeriesName].Points.AddXY(Convert.ToInt32(rowc["s_day"]), Convert.ToInt32(rowc["AVG_cons"]));
                    }
                }
            }//End foreach
        }