scholastic/Form6_2.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.Windows.Forms;

namespace scholastic
{
    public partial class Form6_2 : Form
    {
        DataTable mytable;
        SqlConnection mycon;
        string pstr;
        public Form6_2()
        {
            InitializeComponent();
        }
        private void Showdata()
        {
            string constr = "server=.\\sql2005;database=mydata;uid=sa;pwd=sa";
            mycon = new SqlConnection(constr);
            string mysql = "select * from class";
            SqlDataAdapter myada = new SqlDataAdapter(mysql, mycon);
            mytable = new DataTable();
            myada.Fill(mytable);
            dataGridView1.DataSource = mytable.DefaultView;
            mycon.Close();
        }
        private void Form6_2_Load(object sender, EventArgs e)
        {
            Showdata();
            textBox1.Text = mytable.Rows[0][2].ToString(); //赋值
            textBox2.Text = mytable.Rows[0][3].ToString();
            textBox3.Text = mytable.Rows[0][4].ToString();
        }

        private void button1_Click(object sender, EventArgs e)
        {
            if (textBox1.Text == "" || textBox2.Text == "" || textBox3.Text == "")
            {
                MessageBox.Show("修改数据记录信息不完整，请重新登录！", "信息提示", MessageBoxButtons.OK, MessageBoxIcon.Information);
            }
            else
            {
                mycon.Open();
                string myupdate = "update class set 年级='" + textBox1.Text + "',班级=" + Convert.ToInt32(textBox2.Text) + ",人数=" + Convert.ToInt32(textBox3.Text) + " where 班级='" + Convert.ToInt32(textBox2.Text) + "' and 年级='" + textBox1.Text + "' and 专业='" + pstr + "'";
                SqlCommand mycom = new SqlCommand(myupdate, mycon);
                mycom.ExecuteNonQuery();
                mycon.Close();
                mycon.Dispose();
                Showdata();
                MessageBox.Show("已成功修改该条数据库记录信息！", "信息提示", MessageBoxButtons.OK, MessageBoxIcon.Information);
            }
        }

        private void button2_Click(object sender, EventArgs e)