ASP.NET C# Tutorial In Urdu - How to load data dynamically in chart control

Code is below.

using System;
using System.Data;
using System.Data.SqlClient;
using System.Configuration;

namespace Chart2
{
    public partial class Default : System.Web.UI.Page
    {
        protected void Page_Load(object sender, EventArgs e)
        {
            if (!IsPostBack)
            { 
                LoadData();
            }
        }

        private void LoadData()
        {
            LoadDataInChart();
        }

        private void LoadDataInChart()
        {
            Chart1.DataSource = GetData();
            Chart1.Series["Series1"].XValueMember = "Year";
            Chart1.Series["Series1"].YValueMembers = "Total";
            Chart1.DataBind();
        }

        private DataTable GetData()
        {
            using (SqlConnection conn = new SqlConnection(ConfigurationManager.ConnectionStrings["dbx"].ConnectionString))
            {
                using (SqlCommand cmd = new SqlCommand("usp_Chart2", conn))
                {
                    cmd.CommandType = CommandType.StoredProcedure;

                    conn.Open();

                    cmd.Parameters.AddWithValue("@StartYear", StartYearDropDownList.SelectedValue);
                    cmd.Parameters.AddWithValue("@EndYear", EndYearDropDownList.SelectedValue);

                    SqlDataReader reader = cmd.ExecuteReader();

                    DataTable dtData = new DataTable();
                    dtData.Load(reader);

                    return dtData;
                }
            }
        }

        protected void GoButton_Click(object sender, EventArgs e)
        {
            LoadDataInChart();
        }
    }
}

Stored Procedure: usp_Chart2

CREATE PROCEDURE usp_Chart2
(
  @StartYear NVARCHAR(50)
 ,@EndYear NVARCHAR(50)
)
AS
 BEGIN

  SELECT SUM(Total) AS 'Total'
    ,DATEPART(yyyy, DateOfOrder) AS 'Year'
  FROM [dbo].[Orders]
  GROUP BY DATEPART(yyyy, DateOfOrder)
  HAVING DATEPART(yyyy, DateOfOrder) >= @StartYear AND DATEPART(yyyy, DateOfOrder) <= @EndYear

 END