How to get data for circular gauge from database using ASP.NET Web Forms?

   Code behind:

            CircularScales scale1 = new CircularScales();

            List<Pointers> pointers = new List<Pointers>();

            Pointers pointer1 = new Pointers();

            pointer1.Value = 0;

            scale1.Pointers.Add(pointer1);

            scale1.ShowRanges = true;

            scale1.ShowScaleBar = true;

            this.CircularGauge.Scales.Add(scale1);

            this.CircularGauge.BackgroundColor = "transparent";

            this.CircularGauge.EnableAnimation = true;

      aspx page:

               <ej:CircularGauge ClientIDMode="Static" runat="server" ID="CircularGauge">       

        </ej:CircularGauge>

           String strConnString =  ConfigurationManager

                 .ConnectionStrings["DefaultConnection1"].ConnectionString;

            SqlDataReader rt;

            SqlConnection con;

            SqlCommand cmd = new SqlCommand();

            con = new SqlConnection(strConnString);

            cmd.CommandType = CommandType.StoredProcedure;

            //stored procedure command execution

            cmd.CommandText = "GetPointerDetails";

            cmd.Connection = con;

            con.Open();

            // read the returned result form the procedure

            rt = cmd.ExecuteReader();

            if (rt.Read())

            {

                this.CircularGauge.Scales[0].Pointers[0].Value = Convert

                            .ToDouble(rt.GetValue(0));

            }       

            con.Close();

            con.Dispose();