windows forms 实现数据库简单账号密码登录

数据库信息

代码

using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.Windows.Forms;
using System.Data.SqlClient;
namespace DateBasevis1
{
    public partial class Form1 : Form
    {
        public Form1()
        {
            InitializeComponent();
        }

        private void theSign_Click(object sender, EventArgs e)
        {
            string strcon = @"server = LAPTOP-4JLI4OAI; database = students; integrated security = True";
            SqlConnection conn = new SqlConnection(strcon);
            conn.Open();
            if (conn.State == ConnectionState.Open)
            {
                SqlCommand cmd = new SqlCommand();
                cmd.Connection = conn;
                cmd.CommandText = "select users_id,pwd from users where name='" + theUsrs.Text + "'" + "and pwd='" + thePwd.Text+"'";
                //MessageBox.Show("select users_id,pwd from users where name='" + theUsrs.Text + "'" + "and pwd='" + thePwd.Text + "'");
                SqlDataReader sqlread = cmd.ExecuteReader();
                if (sqlread.Read())
                {

                    MessageBox.Show("登录成功！");
                    this.Visible = false;
                    Form1 mForm = new Form1();
                    mForm.Show();
                }
                else
                {

                    MessageBox.Show("登录失败");
                }

            }
        }
    }
}