/// <summary>  
        /// 修改程序在注册表中的键值  
        /// </summary>  
        /// <param name="isAuto">true:开机启动,false:不开机自启</param> 
        private void AutoStart(bool isAuto = true, bool showinfo = true)
        {
            try
            {
                if (isAuto == true)
                {
                    RegistryKey R_local = Registry.CurrentUser;//RegistryKey R_local = Registry.CurrentUser;
                    RegistryKey R_run = R_local.CreateSubKey(@"SOFTWARE\Microsoft\Windows\CurrentVersion\Run");
                    R_run.SetValue("应用名称", Application.ExecutablePath);
                    R_run.Close();
                    R_local.Close();
                }
                else
                {
                    RegistryKey R_local = Registry.CurrentUser;//RegistryKey R_local = Registry.CurrentUser;
                    RegistryKey R_run = R_local.CreateSubKey(@"SOFTWARE\Microsoft\Windows\CurrentVersion\Run");
                    R_run.DeleteValue("应用名称", false);
                    R_run.Close();
                    R_local.Close();
                }
            }
            catch (Exception)
            {
                if (showinfo)
                    MessageBox.Show("您需要管理员权限修改", "提示");
            }
        }

注：该程序的启动项设置到HKEY_Current_User 下，推荐。如果想改在HKEY_LOCAL_MACHINE，只需将CurrentUser改为LocalMachine，即

// 添加到 当前登陆用户的 注册表启动项
RegistryKey RKey = Registry.CurrentUser.CreateSubKey(@"SOFTWARE\Microsoft\Windows\CurrentVersion\Run");
RKey.SetValue("AppName", @"C:\AppName.exe");

// 添加到 所有用户的 注册表启动项
RegistryKey RKey = Registry.LocalMachine.CreateSubKey(@"SOFTWARE\Microsoft\Windows\CurrentVersion\Run");
RKey.SetValue("AppName", @"C:\AppName.exe");