Billing.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 Billing : Form
    {
        public Billing()
        {
            InitializeComponent();
            Populate();
        }

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

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

        private void Populate()
        {
            try
            {
                Con.Open();
                string query = "select * from BookTb1";
                SqlDataAdapter sda = new SqlDataAdapter(query, Con);
                SqlCommandBuilder builder = new SqlCommandBuilder(sda);
                var ds = new DataSet();
                sda.Fill(ds);
                BookDGV.DataSource = ds.Tables[0];
                Con.Close();
            }
            catch (Exception ex)
            {
                MessageBox.Show(ex.Message);
            }
        }

        private void UpdateBook()
        {
            int newQty = stock - Convert.ToInt32(QtyTb.Text);
            try
            {
                Con.Open();
                string query = "update BookTb1 set BQty = " + newQty + " where BId = " + key + "";
                SqlCommand cmd = new SqlCommand(query, Con);
                cmd.ExecuteNonQuery();
                MessageBox.Show("添加到购物车成功！！！");
                Con.Close();
                Populate();
                Reset();