Draw Pie chart in asp.net

using System;
using System.Data;
using System.Configuration;
using System.Collections;
using System.Web;
using System.Web.Security;
using System.Web.UI;
using System.Web.UI.WebControls;
using System.Web.UI.WebControls.WebParts;
using System.Web.UI.HtmlControls;
using System.Drawing;
using System.Drawing.Imaging;

public partial class Chart : System.Web.UI.Page
{
    public Bitmap myImage;
    public Graphics g;
    public double[] p;
    public string[] GLabel;
    public Brush[] myBrushes;
   protected void Page_Load(object sender, EventArgs e)
    {
        setvalues();
        initialiseGraphics();
        g.Clear(Color.WhiteSmoke);
        drawPieChart(g);
        myImage.Save(Response.OutputStream, System.Drawing.Imaging.ImageFormat.Jpeg);
    }
    public void setvalues()
    {
        int size = 6;

        DefineArrays(size);

        p[0] = 20.12;
        p[1] = 10.12;
        p[2] = 16.40;
        p[3] = 15.29;
        p[4] = 12.12;
        p[5] = 17.21;

        GLabel[0] = "A";
        GLabel[1] = "B";
        GLabel[2] = "C";
        GLabel[3] = "D";
        GLabel[4] = "E";
        GLabel[5] = "F";

    }

    public void DefineArrays(int size)
    {
        p = new double[size];
        GLabel = new string[size];
        myBrushes = new Brush[20];

    }

    private void initialiseGraphics()
    {
        try
        {
            myImage = new Bitmap(500, 300, PixelFormat.Format32bppRgb);
            g = Graphics.FromImage(myImage);
            createBrushes();
        }
        catch (Exception ex)
        {
            throw ex;
        }
    }
    public void createBrushes()
    {
        try
        {
            //Method to create brushes of specific colours

            myBrushes[0] = new SolidBrush(Color.Red);
            myBrushes[1] = new SolidBrush(Color.Blue);
            myBrushes[2] = new SolidBrush(Color.Yellow);
            myBrushes[3] = new SolidBrush(Color.Green);
            myBrushes[4] = new SolidBrush(Color.Tan);
            myBrushes[5] = new SolidBrush(Color.SkyBlue);
            myBrushes[6] = new SolidBrush(Color.Orange);
            myBrushes[7] = new SolidBrush(Color.PaleGreen);
            myBrushes[8] = new SolidBrush(Color.Silver);
            myBrushes[9] = new SolidBrush(Color.SeaGreen);
            myBrushes[10] = new SolidBrush(Color.White);
        }
        catch (Exception ex)
        {
            throw ex;
        }
    }
    public void drawPieChart(Graphics g)
    {
        try
        {
            int i;
            double total = 0;
            double percentage;
            double angleSoFar = 0.0;

            for (i = 0; i < p.Length; i++)
            {
                total = total + p[i];
            }
            for (i = 0; i < p.Length; i++)
            {
                percentage = double.Parse(p[i].ToString()) / double.Parse(total.ToString()) * 360;

                g.FillPie(myBrushes[i], 25, 25, 250, 250, float.Parse(angleSoFar.ToString()), float.Parse(percentage.ToString()));
    
                angleSoFar = angleSoFar + percentage;

                g.FillRectangle(myBrushes[i], 350, 25 + (i * 30), 15, 15);

                g.DrawString("Town " + GLabel[i], new Font("Verdana", 8, FontStyle.Bold), Brushes.Brown, 390, 15 + (i * 30) + 10);
            }


        }
        catch (Exception ex)
        {
            throw ex;
        }
    }
}