求纠正错误

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

namespace Login
{
    public partial class Form1 : Form
    {
        public Form1()
        {
            InitializeComponent();
        }

        private void button1_Click(object sender, EventArgs e)
        {
            String name;
            String password;
            name = textBox1.Text;
            password = textBox2.Text;
            if (textBox1.Text.Equals("Admin") && textBox2.Text.Equals("123456"))
            {
                MessageBox.Show("登录成功！");
            }

            else
            {
                MessageBox.Show("用户或密码不正确！ 请核对后重新登录！");
            }
        }

        private void button2_Click(object sender, EventArgs e)
        {
            this.Hide();
        }


        private void radioButton2_CheckedChanged(object sender, EventArgs e)
        {
            if (radioButton2.Checked)
            {
                name.Enabled = true;
                password.Enabled = true;
                textBox1.Enabled = true;
                textBox2.Enabled = true;

            }
            else
           
                name.Enabled = false;
                password.Enabled = false;
                textBox1.Enabled = false;
                textBox2.Enabled = false;

            }
        }
    }
}
  错误： 应输入类型、命名空间定义或文件尾