Form1.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 WindowsFormsApplication1
{
    public partial class Form1 : Form
    {
        public Form1()
        {
            InitializeComponent();
            
        }

        private void Form1_Load(object sender, EventArgs e)
        {

        }

        private void button1_Click(object sender, EventArgs e)
        {
            var uid = textBox1.Text;
            var pwd = textBox2.Text;

            if (uid == " " || pwd == " ")
            {
                MessageBox.Show("账号密码不能为空！", "提示", MessageBoxButtons.OKCancel, MessageBoxIcon.Warning);
            }
            else 
            {
                var sql = string.Format("select * from users where username = '{0}' and password = '{1}'", uid, pwd);

                var dt = DBHelper.GetData(sql);

                if (dt.Rows.Count == 1)
                {
                    MessageBox.Show("登陆成功！", "提示", MessageBoxButtons.OKCancel, MessageBoxIcon.Asterisk);
                    Form3 f3 = new Form3();
                    this.Hide();
                    f3.Show();
                }
                else 
                {
                    MessageBox.Show("账号密码错误！", "提示", MessageBoxButtons.OKCancel, MessageBoxIcon.Warning);
                }

                
            }

            
            
            
            
        }