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    public Form1()        {            InitializeComponent();        }        private void button1_Click(object sender, EventArgs e)        {            Graphics g = this.CreateGraphics();//建立GDI對像            //建立畫筆(顏色)            Pen npen = new Pen(Brushes.Red);            //建立兩個點            Point n1 = new Point(20, 20);            Point n2 = new Point(255, 255);            g.DrawLine(npen, n1, n2);        }        private void Form1_Paint(object sender, PaintEventArgs e)        {            Graphics g = this.CreateGraphics();//建立GDI對像            //建立畫筆(顏色)            Pen npen = new Pen(Brushes.Red);            //建立兩個點            Point n1 = new Point(20, 20);            Point n2 = new Point(255, 255);            g.DrawLine(npen, n1, n2);        }        private void button2_Click(object sender, EventArgs e)        {            Graphics ng = this.CreateGraphics();            //建立畫筆            Pen npen = new Pen(Brushes.Red);            Size sz=new System.Drawing.Size(100,100);            Rectangle res = new Rectangle(new Point(50, 50), sz);            ng.DrawRectangle(npen, res);        }        private void button3_Click(object sender, EventArgs e)        {            Graphics g = this.CreateGraphics();            Pen npen = new Pen(Brushes.Blue);            Size sz = new System.Drawing.Size(180, 180);            Rectangle rec = new Rectangle(new Point(150, 150), sz);            g.DrawPie(npen, rec, -50, -50);        }        private void pictureBox1_DoubleClick(object sender, EventArgs e)        {            Random rd = new Random();            string str = null;            for (int i = 0; i < 5; i++)            {                int n1=rd.Next(1, 10);                str += n1;                }            Bitmap bmp=new Bitmap(120,40);            //建立gdi            Graphics gd = Graphics.FromImage(bmp);            //畫圖            for (int i = 0; i < str.Length; i++)            {                Point pt = new Point(i * 20, 0);                string[] fonts={"微軟雅黑","宋體","黑體","隸書","仿宋"};                Color[] colors={Color.Red,Color.Black,Color.Blue,Color.Orange,Color.Plum};                gd.DrawString(str[i].ToString(), new Font(fonts[rd.Next(0, 5)], 15, FontStyle.Bold), new SolidBrush(colors[rd.Next(0, 5)]), pt);            }            //給圖片加線            for (int i = 0; i < 20; i++)            {                Point xpt1 = new Point(rd.Next(0, bmp.Width), rd.Next(0, bmp.Height));                Point xpt2 = new Point(rd.Next(0, bmp.Width), rd.Next(0, bmp.Height));                gd.DrawLine(new Pen(Brushes.Red), xpt1, xpt2);            }            //給圖片加點            for (int i = 0; i < 50; i++)            {                Point p1 = new Point(rd.Next(0, bmp.Width), rd.Next(0, bmp.Height));                bmp.SetPixel(p1.X, p1.Y, Color.Black);            }            //將圖片放到pictureBox中            pictureBox1.Image = bmp;        }

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C#驗證碼