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);
        }
    }
}