using?BookManagementSystem;
using?System;
using?System.Collections.Generic;
using?System.ComponentModel;
using?System.Data;
using?System.Drawing;
using?System.IO;
using?System.Linq;
using?System.Runtime.Serialization.Formatters.Binary;
using?System.Text;
using?System.Windows.Forms;

namespace?記住密碼
{
????public?partial?class?Form1?:?Form
????{
????????List?users;?
????????public?Form1（）
????????{
????????????InitializeComponent（）;
????????}

????????private?void?button1_Click（object?sender?EventArgs?e）
????????{
????????????string?loginName?=?this.comboBox2.Text.Trim（）;??//將下拉框的登錄名先保存在變量中??
????????????for?（int?i?=?0;?i?????????????{
????????????????if?（this.comboBox2.Items[i].ToString（）?==?loginName）
????????????????{
????????????????????this.comboBox2.Items.RemoveAt（i）;??//如果當前登錄用戶在下拉列表中已經存在，則將其移除??
????????????????????break;
????????????????}
????????????}
????????????for?（int?i?=?0;?i?