Draw Ellipse

using System;
using System.Drawing;
using System.Windows.Forms;

namespace ellipse
{
    public partial class Form1 : Form
    {
        public int xE = 200;
        public int yE = 200;
        public int widthE = 100;
        public int heightE = 60;

        Pen pen;
        Graphics g;

        private void trackBar2_Scroll(object sender, EventArgs e)
        {
            if (checkBox1.Checked)
            {
                trackBar2.Value = trackBar1.Value;
                trackBar1.Value = trackBar2.Value;
            }

            widthE = trackBar1.Value * 10;
            heightE = trackBar2.Value * 10;

            g.Clear(Color.White);
            g.DrawEllipse(pen, xE - widthE, yE - heightE, widthE * 2, heightE * 2);
        }

        private void checkBox1_CheckedChanged(object sender, EventArgs e)
        {
            if (checkBox1.Checked)
            {
                trackBar2.Value = trackBar1.Value;
                trackBar2_Scroll(sender, e);
            }
        }

        public Form1()
        {
            InitializeComponent();

            pen = new Pen(Color.Black, 1);
            g = this.CreateGraphics();
        }
    }
}