这是一个自己做的关于C#软件注册码小程序的代码（略去了窗体代码）

下图是小程序截图

using System;

using System.Drawing;

using System.Collections;

using System.ComponentModel;

using System.Windows.Forms;

using System.Data;

using System.Configuration;

using System.IO;

using System.Security.Cryptography;

using System.Management;

namespace Messagebox

{

    /// <summary>

    /// Form1 的摘要说明。

    /// </summary>

    public class Form1 : System.Windows.Forms.Form

    {

        private System.Windows.Forms.Button button1;

        private System.Windows.Forms.TextBox textBox1;

        private Button button2;

        private Button button3;

        private Button button4;

        /// <summary>

        /// 必需的设计器变量。

        /// </summary>

        private System.ComponentModel.Container components = null;

        public Form1()

        {

            //

            // Windows 窗体设计器支持所必需的

            //

            InitializeComponent();

            //

            // TODO: 在InitializeComponent 调用后添加任何构造函数代码

            //

        }

        /// <summary>

        /// 清理所有正在使用的资源。

        /// </summary>

        protected override void Dispose(bool disposing)

        {

            if (disposing)

            {

                if (components != null)

                {

                    components.Dispose();

                }

            }

            base.Dispose(disposing);

        }

        /// <summary>

        /// 应用程序的主入口点。

        /// </summary>

        [STAThread]

        static void Main()

        {

            Application.Run(new Form1());

        }

        private void button1_Click(object sender, System.EventArgs e)

        {

            Hasher hash = new Hasher();

            textBox1 .Text = hash.hashGetDriveID().ToString();

        }

        private void button2_Click(object sender, EventArgs e)

        {

            Hasher shit = new Hasher ();

            textBox1.Text = shit.Sern();

        }

        private void button3_Click(object sender, EventArgs e)

        {

           Hasher shit = new Hasher ();

           textBox1.Text = shit.GetDriveID();

        }

        private void button4_Click(object sender, EventArgs e)

        {

             Hasher shit = new Hasher ();

             textBox1.Text = shit.GetCpuID();

        }

    }

    public class Hasher

    {

        public string _HashText; //待加密的字符串

        // public Hasher()

        // {

        // }

        // 需要产生加密哈希的字符串

        public string HashText

        {

            set

            {

                _HashText = value;

            }

            get

            {

                return _HashText;

            }

        }

        /// 使用MD5CryptoServiceProvider类产生哈希值。不需要提供密钥。

        /// </summary>

        /// <returns></returns>

        public string MD5Hasher()

        {

            byte[] MD5Data = System.Text.Encoding.UTF8.GetBytes(HashText);

            MD5 Md5 = new MD5CryptoServiceProvider();

            byte[] Result = Md5.ComputeHash(MD5Data);

            return Convert.ToBase64String(Result); //返回长度为字节字符串

        }

        //获取cpu序列号

        public String GetCpuID()

        {

            ManagementClass mc = new ManagementClass("Win32_Processor");

            ManagementObjectCollection moc = mc.GetInstances();

            String strCpuID = null;

            foreach (ManagementObject mo in moc)

            {

                strCpuID = mo.Properties["ProcessorId"].Value.ToString();

                break;

            }

            return strCpuID;

        }//end method

        //获取硬盘序列号

        public String GetDriveID()

        {

 ManagementObject mo = new ManagementObject("win32_LogicalDisk.device);

            mo.Get();

            return mo.GetPropertyValue("VolumeSerialNumber").ToString();

        }

        public String strJia()

       {

            string strJiami = "";

            strJiami = GetCpuID() + GetDriveID();

            return strJiami;

        }

        public string jiqixuelie;

        public string duijiqima = null;

        ///得到机器码

        public string hashGetDriveID()

        {

            Hasher hs = new Hasher();

            hs.HashText = hs.strJia();

            string jiqi = hs.MD5Hasher();

            duijiqima = jiqi.Substring(8, 5);

            return duijiqima;

        }

        public string Sern()

        //最终的序列号//m为配置文件值

        //x为序列号值

        //css进行比较该注册码是否正确

        {

            //获取机器码

            Hasher hs = new Hasher();

            //获取序列号

            Hasher hash = new Hasher();

            hash.HashText = hs.hashGetDriveID().ToString();

            jiqixuelie = hash.MD5Hasher();

            return jiqixuelie;

        }

    }

}