problem about value shown on x-axis on MSchart

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C#

chart

This picture is my chart

http://image.ohozaa.com/view/86bve[^]

on x-axis is name of product that i query from my database. you can see the right of chart is a series of product that have 3 series but on x-axis have name show only one product .that is a series name for orange color series

string sql2 = "select NAME_Product from Product where  Product.ID_Product = '" + idtoselect + "' ";
                        SqlCommand testcommand2 = new SqlCommand(sql2, conn);
                        rdr = testcommand2.ExecuteReader();

                        if (rdr.Read())
                        {
                            test = rdr["NAME_Product"].ToString();
                        }
                        rdr.Close();
                            string sql = "SELECT NAME_Product,QUANTITY_Product FROM Product  where  Product.ID_Product = @ID";
                            da = new SqlDataAdapter(sql, conn);

                            da.SelectCommand.Parameters.AddWithValue("@ID", idtoselect);
                            datatb = new DataTable();
                            da.Fill(datatb);
                            da.Fill(datatb2);
       
                            chart1.Series.Add(test);
                            
                            for (int i = 0; i < datatb.Rows.Count; i++)
                            {
                                chart1.Series[test].Points.AddXY(datatb.Rows[i].ItemArray.GetValue(0), datatb.Rows[i].ItemArray.GetValue(1));
                                
                            }
                            chart1.Series[test].ChartArea = "ChartArea1";
                            chart1.Series[test].BorderWidth = 4;
                            chart1.Series[test].ChartType = System.Windows.Forms.DataVisualization.Charting.SeriesChartType.Column;
                            chart1.Series[test].YValueMembers = "QUANTITY_Product";
                            chart1.Series[test].XValueMember = "NAME_Product";
                            chart1.ChartAreas["ChartArea1"].AxisX.LabelStyle.Angle = 45;

      
                            chart1.DataBind();

How can i get Name product(all series that i have select) on x-axis

Please any one to help me