Login.cs

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using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Text;
using System.Windows.Forms;
using System.Data.SqlClient;

namespace 图书管理系统
{
    public partial class Login : Form
    {
        public string uid;
        public string pwd;
        private Form1 form;
        public Login(Form1 form1)
        {
            InitializeComponent();
            this.form = form1;
           
        }

        private void 管理员登录_Load(object sender, EventArgs e)
        {

        }

        private void btnDone_Click(object sender, EventArgs e)
        {
            uid = tbUid1.Text;
            pwd = tbPwd.Text;
            this.Close();
        }

        private void btnMod_Click(object sender, EventArgs e)
        {
            panel1.Visible = true;
            
        }

        private void btnClose_Click(object sender, EventArgs e)
        {
            panel1.Visible = false;
        }
        //修改密码
        private void btnModify_Click(object sender, EventArgs e)
        {
            DataSet ds = new DataSet();
            Form1 form = new Form1();
            form.cmd.CommandText = "select count(*) from ManagerLogin where 用户名='" + tbUid.Text + "' and 密码='" + tbPwdOld.Text + "'";
            if ((int)form.cmd.ExecuteScalar() <= 0)
            {
                MessageBox.Show("用户名或原始密码错误！");
            }
            if (tbPwdNew.Text != tbPwdNew1.Text)
            {
                MessageBox.Show("前后两次密码输入不一致！");
            }