Paint Application Code in C#

Write a C# Application and make a paint using system. Drawing

using System.Drawing;

namespace Paint_App

{

    public partial class Form1 : Form

    {

        public Form1()

        {

            InitializeComponent();

        }

        bool Paint = false;

        SolidBrush SB = new SolidBrush(Color.Black);

        private void btn_ColorChange_Click(object sender, EventArgs e)

        {

            colorDialog1.ShowDialog();

            SB.Color = colorDialog1.Color;

        }

        private void btn_Clear_Click(object sender, EventArgs e)

        {

            Graphics g = Panel_Paint.CreateGraphics();

            g.Clear(Panel_Paint.BackColor);

        }

        private void Panel_Paint_MouseDown(object sender, MouseEventArgs e)

        {

            Paint = true;          

        }

        private void Panel_Paint_MouseUp(object sender, MouseEventArgs e)

        {

            Paint = false;

        }

        private void Panel_Paint_MouseMove(object sender, MouseEventArgs e)

        {

            if (Paint)

            {

                Graphics g2 = Panel_Paint.CreateGraphics();

                g2.FillEllipse(SB, e.X, e.Y, Trak_Brush.Value, Trak_Brush.Value);

                g2.Dispose();

            }

        }

    }

}