Form1.cs

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using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.Windows.Forms;

namespace 验证码
{
    public partial class Form1 : Form
    {
        public Form1()
        {
            InitializeComponent();
        }
       
        private void pictureBox1_Click(object sender, EventArgs e)
        {
            Random r = new Random();
            //生成随机数
            string str = null;
            for (int i = 0; i < 4; i++)
            {
                int assii = r.Next(48, 122);

                if ((assii >= 48 && assii <= 57) || (assii > 64 && assii < 91) || (assii > 96 && assii < 123))
                {
                    str += (char)assii;
                }
                else
                {

                    i--;
                }
                //下载于www.51aspx.com
            }
            //画到图片中吧
            Bitmap bmp = new Bitmap(130, 40);
            Graphics g = Graphics.FromImage(bmp);
            bmp.MakeTransparent();
            pictureBox1.Image = bmp;

            string[] fonts = { "黑体", "Buxton Sketch", "楷体", "微软雅黑", "SketchFlow Print" };
            Color[] colors = new Color[] { Color.DarkSeaGreen, Color.Gray, Color.Beige, Color.BlanchedAlmond, Color.Cyan, Color.GreenYellow };
            Color[] FontColor = new Color[] { Color.DarkBlue, Color.DarkCyan, Color.DarkGoldenrod, Color.DarkGray, Color.DarkGreen, Color.DarkKhaki, Color.DarkMagenta, Color.DarkOrange, Color.DarkRed };
            for (int i = 0; i < 4; i++)
            {
                Point p = new Point(i * 30, 0);
                g.DrawString(str[i].ToString(), new Font(fonts[r.Next(0, fonts.Length)], 25, FontStyle.Bold), new SolidBrush(FontColor[r.Next(0, FontColor.Length)]), p);

            }

            //画线加画点

            for (int i = 0; i < 10; i++)
            {
                Point p1 = new Point(r.Next(0, bmp.Width), r.Next(0, bmp.Height));