登录页面.cs

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

namespace WindowsFormsApp1
{
    public partial class 登录页面 : Form
    {
        public 登录页面()
        {
            InitializeComponent();
        }

        private void button1_Click(object sender, EventArgs e)
        {
            if(textBox1.Text != "" && textBox2.Text != "")
            {
                Login();
            }
            else
            {
                MessageBox.Show("输入有空项，请重新输入。");
            }
        }
        public Boolean Login()
        {
            //user
            if(radioButtonuser.Checked == true)
            {
                Dao dao = new Dao();
                string sql = $"select * from t_user where id='{textBox1.Text}' and psw = '{textBox2.Text}'";
                IDataReader dc = dao.read(sql);
                if(dc.Read())
                {
                    Data.UID = dc["id"].ToString();
                    Data.Uname = dc["name"].ToString();
                    MessageBox.Show("登陆成功");
                    user1 user = new user1();
                    this.Hide();
                    user.ShowDialog();
                    this.Show();
                    return true;
                }
                else
                {
                    MessageBox.Show("登陆失败");
                }
            }
            //admin
            if(radioButtonadmin.Checked == true)
            {
                Dao dao = new Dao();
                string sql = $"select * from t_admin where id='{textBox1.Text}' and psw = '{textBox2.Text}'";
                IDataReader dc = dao.read(sql);