Login.cs

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

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

        // X 标签
        private void label8_Click(object sender, EventArgs e)
        {
            Application.Exit();
        }

        SqlConnection Con = new SqlConnection(@"Data Source=.;Initial Catalog=WhiteBookShopDb;Integrated Security=True;");

        public static string UserName = "";

        private void LoginBtn_Click(object sender, EventArgs e)
        {
            try
            {
                Con.Open();
                SqlDataAdapter sda = new SqlDataAdapter("select count(*) from UserTb1 where UName = '" + UserNameLbl.Text.Trim() + "' and UPassword = '" + PwdLbl.Text.Trim() + "'", Con);
                DataTable dt = new DataTable();
                sda.Fill(dt);
                if (dt.Rows[0][0].ToString() == "1")
                {
                    UserName = UserNameLbl.Text;
                    Billing obj = new Billing();
                    obj.Show();
                    this.Hide();
                    Con.Close();
                }
                else
                {
                    MessageBox.Show("用户名或密码错误！！！");
                }
                Con.Close();
            }
            catch (Exception ex)
            {
                MessageBox.Show(ex.Message);
            }
        }

        private void label4_Click(object sender, EventArgs e)
        {