我在编译连接数据库登入功能的时候   取消按钮的指令

        private void btnCancel_Click(object sender, EventArgs e)
        {
            txtName.Text = "";
            txtPwd.Text = "";
            txtName.Focus();
        }
提示错误  说" 应输入 class、delegate、enum、interface 或 struct"


完整指令:
using System;
using System.Collections.Generic;
using
using System.Data;
using System.Drawing;
using System.Linq;
using System.Text;
using System.Windows.Forms;
using System.Data.SqlClient;
namespace MySchool
{
    public partial class Login : Form
    {
        public Login()
        {
            InitializeComponent();
        }

        private void Login_Load(object sender, EventArgs e)
        {

        }

        private void btnYes_Click(object sender, EventArgs e)
        {
            string userName = txtName.Text;
            string password = txtPwd.Text;
            string connString=@"Data Source=f-pc;Initial Catalog=MySchool;Integrated Security=True";
            SqlConnection connection=new SqlConnection (connString);
            string sql=String.Format("select count(*) from [User] where userName='{0}' and password='{1}'",userName,password );
            try
            {
                connection.Open ();
                SqlCommand command=new SqlCommand(sql,connection );
                int num=(int)command.ExecuteScalar();
                if(num> 0 )
                {
                    MessageBox.Show("欢迎进入成绩管理系统!","登入成功", MessageBoxButtons.OK,MessageBoxIcon.Information);
                    MainFrm mainForm=new MainFrm();
                    mainForm.Show();
                    this.Visible=false;
                }
                else
                {
                  MessageBox.Show ("您输入的用户名或密码错误!","登入失败",MessageBoxButtons.OK,MessageBoxIcon.Exclamation );
                }
            }
              catch (Exception ex)
              {
              MessageBox.Show (ex.Message,"操作数据库出错!",MessageBoxButtons.OK ,MessageBoxIcon.Exclamation );
              }
              finally
              {
                connection.Close();
              }
            }}
  
        private void btnCancel_Click(object sender, EventArgs e)
        {
            txtName.Text = "";
            txtPwd.Text = "";
            txtName.Focus();
        }

    }
(跟着书一步一步做的)
希望达人帮我解答一下