Code

using Microsoft.Win32;

private void btnShowOpen_Click(object sender, EventArgs e)

        {

            OpenFileDialog open = new OpenFileDialog();

            open.Filter = "可执行文件(*.exe)|*.exe";

            if (open.ShowDialog() == DialogResult.OK)

            {

                txtPath.Text = open.FileName;

            }

        }

        private bool runWhenStart(bool started,string exeName, string path)

        {          

            RegistryKey key = Registry.LocalMachine.OpenSubKey("SOFTWARE\\Microsoft\\Windows\\CurrentVersion\\Run", true);//打开注册表子项

            if (key == null)//如果该项不存在的话，则创建该子项

            {

                key = Registry.LocalMachine.CreateSubKey("SOFTWARE\\Microsoft\\Windows\\CurrentVersion\\Run");

            }

            if (started == true)

            {

                try

                {                   

                    key.SetValue(exeName, path);//设置为开机启动

                    key.Close();

                }

                catch

                {

                    return false;

                }

            }

            else

            {

                try

                {                   

                    key.DeleteValue(exeName);//取消开机启动

                    key.Close();

                }

                catch

                {

                    return false;

                }

            }

            return true;

        }

        private void btnSet_Click(object sender, EventArgs e)

        {

            if (txtPath.Text == "")//检查是否选择了文件

            {

                MessageBox.Show("请选择要随计算机一起启动的程序路径！", "消息", MessageBoxButtons.OK, MessageBoxIcon.Information);

                txtPath.Focus();

                return;

            }           

            string path = txtPath.Text.Trim();

            string exeName = path.Substring(path.LastIndexOf("\\") + 1);

            if (!File.Exists(path))//检查该文件是否存在

            {

                MessageBox.Show("文件不存在！", "消息", MessageBoxButtons.OK, MessageBoxIcon.Information);

                txtPath.Text = "";

                txtPath.Focus();

                return;

            }

            if (runWhenStart(true,exeName, path))

            {

                MessageBox.Show("设置成功！", "消息", MessageBoxButtons.OK, MessageBoxIcon.Information);

            }

            else

            {

                MessageBox.Show("设置失败！", "消息", MessageBoxButtons.OK, MessageBoxIcon.Information);

            }

        }

        private void btnCancel_Click(object sender, EventArgs e)

        {

            if (txtPath.Text == "")//检查是否选择了文件

            {

                MessageBox.Show("请选择要撤销随计算机一起启动的程序路径！", "消息", MessageBoxButtons.OK, MessageBoxIcon.Information);

                txtPath.Focus();

                return;

            }

            string path = txtPath.Text.Trim();

            string exeName = path.Substring(path.LastIndexOf("\\") + 1);

            if (!File.Exists(path))//检查该文件是否存在

            {

                MessageBox.Show("文件不存在！", "消息", MessageBoxButtons.OK, MessageBoxIcon.Information);

                txtPath.Text = "";

                txtPath.Focus();

                return;

            }

            if (runWhenStart(false, exeName, path))

            {

                MessageBox.Show("撤销成功！", "消息", MessageBoxButtons.OK, MessageBoxIcon.Information);

            }

            else

            {

                MessageBox.Show("撤销失败！", "消息", MessageBoxButtons.OK, MessageBoxIcon.Information);

            }

        }