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 密码{    public partial class Form1 : Form    {        public Form1()        {            InitializeComponent();        }        private void textBox1_TextChanged(object sender, EventArgs e)        {            textBox1.PasswordChar = ‘*‘;         //设置密码显示方式            textBox1.MaxLength = 16;            //设置密码长度        }        private void button1_Click(object sender, EventArgs e)        {            MessageBox.Show(textBox1.Text);        }    }}