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   源码介绍

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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 yanzhengma
{
    public partial class Form1 : Form
    {
        public Form1()
        {
            InitializeComponent();
        }
        ValidCode validCode;//声明验证码对象
       
        private void linkLabel1_LinkClicked(object sender, LinkLabelLinkClickedEventArgs e)
        {
            //创建验证码对象
            validCode = new ValidCode(5, ValidCode.CodeType.Alphas);
            //把验证码显示到图片中
            this.pictureBox1.Image = Bitmap.FromStream(validCode.CreateCheckCodeImage());
        }

        private void Form1_Load(object sender, EventArgs e)
        {
            //创建验证码对象
            validCode = new ValidCode(5, ValidCode.CodeType.Alphas);
            //把验证码显示到图片中
            this.pictureBox1.Image = Bitmap.FromStream(validCode.CreateCheckCodeImage());
        }

        private void button1_Click(object sender, EventArgs e)
        {
            if (this.textBox1.Text.Trim().ToUpper() == this.validCode.CheckCode)
            {
                MessageBox.Show("验证成功");
            }
            else
            {
                this.lblCheckCode.Visible = true;
                this.lblCheckCode.Text = "*验证码不正确";
                this.lblCheckCode.ForeColor = Color.Red;
            }
        }

        private void textBox1_TextChanged(object sender, EventArgs e)
        {
            this.lblCheckCode.Visible = false;
        }
    }
}