Null reference exception on ms chart control( chart1 is null)

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C#

MSChart

I am new to ms chart i am trying to build column chart form jquery(HighChart) and Mschart control using vs 2010 using same data

I am able to build column chart in jquery(high chart)

but getting Null reference exception on ms chart control

in my build_chart() function

Chart1.DataSource = dt1; // here I am getting null reference exception

i am using jquery ajax on html button click it will invoke webmethod selectRecord()

$.ajax({
       type: "POST",
       url: "Default.aspx/selectRecord",
       data: '{}',
       contentType: "application/json;charset=utf-8",
       dataType: "json",
       success: OnSuccess,
       error: OnErrorCall
   });

<pre> <div> 
   <button id="btn">load chart</button>
  </div>
    <form id="form1" runat="server">
    <div>
    <h1>Microsoft Chart</h1>
    <asp:Chart ID="Chart1" runat="server"><Series><asp:Series Name="Series1"></asp:Series></Series><ChartAreas><asp:ChartArea Name="ChartArea1"></asp:ChartArea></ChartAreas></asp:Chart>
   </div>
    <div>
    <h1>jquery Chart</h1>
    <div id="container1" style="min-width: 310px; height: 400px; margin: 0 auto"></div>

    </div>
    </form>

What I have tried:

    using System;
using System.Collections.Generic;
using System.Linq;
using System.Web;
using System.Web.UI;
using System.Web.UI.WebControls;
using System.Data;
using System.Data.Sql;
using System.Web.Services;
using System.Data.SqlClient;
using System.Web.Script.Serialization;
using System.Web.UI.DataVisualization.Charting;

public partial class _Default : System.Web.UI.Page
{

   
    protected void Page_Load(object sender, EventArgs e)
    {
        Chart1.Series["Series1"].ChartType = SeriesChartType.Column;
    }
    [WebMethod]
    public static string selectRecord()
    {
        _Default d = new _Default();
        DataTable dt = new DataTable();
        SqlConnection conn = new SqlConnection("Data Source=MYSERVER;Initial Catalog=Layout;User ID=admin123;Password=123");
        conn.Open();
        SqlCommand cmd = new SqlCommand("selectage", conn);
        cmd.CommandType = CommandType.StoredProcedure;
        SqlDataAdapter sda = new SqlDataAdapter(cmd);

        string query = "selectage";
        sda.Fill(dt);

        //d.build_chart();

        d.build_chart(query);
       

        string result = DataTableToJsonWithJavaScriptSerializer(dt);
        return result;
    }
    public static string DataTableToJsonWithJavaScriptSerializer(DataTable table)
    {
        JavaScriptSerializer jsSerializer = new JavaScriptSerializer();
        List<Dictionary<string, object>> parentRow = new List<Dictionary<string, object>>();
        Dictionary<string, object> childRow;
        foreach (DataRow row in table.Rows)
        {
            childRow = new Dictionary<string, object>();
            foreach (DataColumn col in table.Columns)
            {
                childRow.Add(col.ColumnName, row[col]);
            }
            parentRow.Add(childRow);
        }
        return jsSerializer.Serialize(parentRow);

    }

    public void build_chart(string query)
    {
        try
        {
            DataTable dt1 = new DataTable();
            //_Default d1 = new _Default();
            SqlConnection conn = new SqlConnection("Data Source=MYSERVER;Initial Catalog=Layout;User ID=admin;Password=123");
            conn.Open();
            SqlCommand cmd = new SqlCommand(query, conn);
            cmd.CommandType = CommandType.StoredProcedure;
            SqlDataAdapter sda = new SqlDataAdapter(cmd);
            sda.Fill(dt1);

            Chart1.DataSource = dt1;  // here i am getting Null Reference Exception 
           
            Chart1.Series[0].ChartType = SeriesChartType.Column;

            Chart1.Series[0].XValueMember = "name";
            Chart1.Series[0].YValueMembers = "age";
            
            Chart1.DataBind();
        }
        catch (NullReferenceException e)
        {
            //eventListener.HandleEvent(Severity.Informational, line.GetType().Name, String.Format("Could not find the customer corresponding to the taxId '{0}' Applicant address will not be imported.", new TaxId(line.TaxId).Masked));
            //Response.Write(e.Message);
            Console.WriteLine(e.Message); 
        }

    }
}