TuShuGuiHaiGuanLiForm.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.Windows.Forms;

namespace MF借书系统
{
    public partial class TuShuGuiHaiGuanLiForm : Form
    {
        //声明中间层引用
        private ZhongJianChen.Class_GuiHaiGuanLi guihai;

        public TuShuGuiHaiGuanLiForm()
        {
            InitializeComponent();
        }

        private void button4_MouseMove(object sender, MouseEventArgs e)
        {
            xia_label.Visible = true;
        }

        private void button4_MouseLeave(object sender, EventArgs e)
        {
            xia_label.Visible = false;
        }

        private void button3_MouseMove(object sender, MouseEventArgs e)
        {
            shang_label.Visible = true;
        }

        private void button3_MouseLeave(object sender, EventArgs e)
        {
            shang_label.Visible = false;
        }

        private void button3_Click(object sender, EventArgs e)
        {
            ISBN_Text.Enabled = false;
            DuzheId_Text.Enabled = false;
            guihai = new ZhongJianChen.Class_GuiHaiGuanLi();
            dataGridView1.DataSource = guihai.getJieShu().Tables[0];
            System.Threading.Thread.Sleep(500);
            ISBN_Text.Text = "";
            DuzheId_Text.Text = "";
            ISBN_Text.Enabled = true ;
            DuzheId_Text.Enabled = true;
        }

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

        private void ISBN_Text_TextChanged(object sender, EventArgs e)