chart1.Series.Clear();

string seriesName1 = "stock";
Series ser1 =  chart1.Series.Add(seriesName1);

ser1.ChartArea = chart1.ChartAreas[0].Name;
ser1.Name = seriesName1;
ser1.ChartType = SeriesChartType.Stock;

ser1.BorderWidth = 3;

ser1.Points.AddXY(1, 44, 11, 34, 37);  // x, high, low, open, close
ser1.Points.AddXY(2, 33, 11, 22, 33);


string seriesName2 = "line";
Series ser2 = chart1.Series.Add(seriesName2);

ser2.ChartArea = chart1.ChartAreas[0].Name;
ser2.Name = seriesName2;
ser2.ChartType = SeriesChartType.Line;
ser2.Points.AddXY(1, 44);
ser2.Points.AddXY(2, 33);