C#TextBox、ToolTip、ErrorProvide的使用例子

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 TextBoxToolTipErrorProvide
{
    public partial class MainForm : Form
    {
        public MainForm()
        {
            InitializeComponent();
        }

        private void MainForm_Load(object sender, EventArgs e)
        {
            toolTip1.SetToolTip(textBoxUserName, "用户名。。。<=10");
            toolTip1.SetToolTip(textBoxPassword, "密码。。。>=5，字母与数字");
            toolTip1.SetToolTip(buttonOK, "显示");
            errorProvider1.BlinkStyle = ErrorBlinkStyle.AlwaysBlink;
        }

        private void textBoxPassword_TextChanged(object sender, EventArgs e)
        {
            textBoxPwdMessage.Text = textBoxPassword.Text;
        }