C# winform图片验证码

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

using System.Data.SqlClient;
namespace Ex12_16
{
    public partial class Form1 : Form
    {
        public Form1（）
        {
            InitializeComponent（）;
        }

        private void Form1_Load（object sender EventArgs e）
        {
            CodeImage（CheckCode（））;
        }

        private string CheckCode（）
        {
            int number;
            char code;
            string checkCode = String.Empty;

            Random random = new Random（）;

            for （int i = 0; i < 4; i++）
            {
                number = random.Next（）;

                if （number % 2 == 

 属性            大小     日期    时间   名称
----------- ---------  ---------- -----  ----
     目录           0  2010-04-06 13:10  Ex12_16\
     文件         910  2007-07-11 11:32  Ex12_16.sln
     文件       15360  2007-07-11 11:32  Ex12_16.suo
     目录           0  2010-04-06 13:10  Ex12_16\bin\
     目录           0  2010-04-06 13:10  Ex12_16\bin\Debug\
     文件       20480  2007-07-11 11:32  Ex12_16\bin\Debug\Ex12_16.exe
     文件       26112  2007-07-11 11:32  Ex12_16\bin\Debug\Ex12_16.pdb
     文件        5632  2007-07-11 11:32  Ex12_16\bin\Debug\Ex12_16.vshost.exe
     文件        3221  2007-07-11 11:32  Ex12_16\Ex12_16.csproj
     文件        3033  2007-07-11 11:32  Ex12_16\Form1.cs
     文件        4096  2007-07-11 11:32  Ex12_16\Form1.Designer.cs
     文件        5814  2007-07-11 11:32  Ex12_16\Form1.resx
     目录           0  2010-04-06 13:10  Ex12_16\obj\
     目录           0  2010-04-06 13:10  Ex12_16\obj\Debug\
     文件         842  2007-07-11 11:32  Ex12_16\obj\Debug\Ex12_16.csproj.GenerateResource.Cache
     文件       20480  2007-07-11 11:32  Ex12_16\obj\Debug\Ex12_16.exe
     文件         180  2007-07-11 11:32  Ex12_16\obj\Debug\Ex12_16.Form1.resources
     文件       26112  2007-07-11 11:32  Ex12_16\obj\Debug\Ex12_16.pdb
     文件         180  2007-07-11 11:32  Ex12_16\obj\Debug\Ex12_16.Properties.Resources.resources
     目录           0  2010-04-06 13:10  Ex12_16\obj\Debug\TempPE\
     文件         268  2007-07-11 11:32  Ex12_16\obj\Ex12_16.csproj.FileList.txt
     文件         466  2007-07-11 11:32  Ex12_16\Program.cs
     目录           0  2010-04-06 13:10  Ex12_16\Properties\
     文件        1162  2007-07-11 11:32  Ex12_16\Properties\AssemblyInfo.cs
     文件        2868  2007-07-11 11:32  Ex12_16\Properties\Resources.Designer.cs
     文件        5612  2007-07-11 11:32  Ex12_16\Properties\Resources.resx
     文件        1090  2007-07-11 11:32  Ex12_16\Properties\Settings.Designer.cs
     文件         249  2007-07-11 11:32  Ex12_16\Properties\Settings.settings