C# 实验4 数据库

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;
using System.Data.SqlClient; 
namespace shiyan4
{
    public partial class Form1 : Form
    {
        SqlDataAdapter adapter;
        DataTable table;
        public Form1()
        {
            InitializeComponent();
        }

        private void button1_Click(object sender, EventArgs e)
        {
            string varNumber = textBox1.Text.Trim();
            if (varNumber ==""||varNumber ==null){MessageBox.Show("请输入你要查询的学号", "提示信息",MessageBoxButtons.OK,MessageBoxIcon.Warning);}
            try
            {string connStr = "Data Source=.\\SQLEXPRESS;AttachDbFilename=|DataDirectory|\\Database1.mdf;Integrated Security=True;User Instance=True";
                SqlConnection conn = new SqlConnection(connStr);
                string sql = "select * from Table1 where 姓名='" + varNumber + "'";
                adapter = new SqlDataAdapter(sql, conn);
                SqlCommandBuilder builder = new SqlCommandBuilder(adapter);

                table = new DataTable();
                adapter.Fill(table);
                dataGridView1.DataSource = table;
                //conn.Close()；
         }
            catch (Exception ee)
            {
                MessageBox.Show(ee.Message, "提示信息", MessageBoxButtons.OK, MessageBoxIcon.Warning);
            }
        }

        private void button2_Click(object sender, EventArgs e)
        {
            textBox1.Text = "";
            dataGridView1.EndEdit();
            try
            {
                adapter.Update(table);
                MessageBox.Show("保存成功");
            }
            catch (Exception ee)
            {
                MessageBox.Show(ee.Message, "保存失败");
            }

        }

        private void dataGridView1_CellContentClick(object sender, DataGridViewCellEventArgs e)
        {

        }
    }
}