黑盒测试等价类划分方法 续

using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.Windows.Forms;

namespace WindowsFormsApplication2
{
    public partial class Form1 : Form
    {
        public Form1()
        {
            InitializeComponent();
        }

        private void button2_Click(object sender, EventArgs e)
        {
            textBox1.Text = "";
            textBox2.Text = "";
            textBox3.Text = "";
            label4.Text = "请先输入";
        }

        private void button1_Click_1(object sender, EventArgs e)
        {
            String[] str = new String[3];

            str[0] = textBox1.Text;
            str[1] = textBox2.Text;
            str[2] = textBox3.Text;

            Boolean res1 = System.Text.RegularExpressions.Regex.IsMatch(str[0], @"^[a-zA-Z\d]{1,6}$");
            Boolean res2 = System.Text.RegularExpressions.Regex.IsMatch(str[1], @"^[a-zA-Z\d]{1,6}$");
            Boolean res3 = System.Text.RegularExpressions.Regex.IsMatch(str[2], @"^[a-zA-Z\d]{1,6}$");

            if (res1)
                label4.Text = "用户名输入正确";
            else
                label4.Text = "用户名输入不正确";
            if (res2)
                label5.Text = "密码输入正确";
            else
                label5.Text = "密码输入不正确";
            if (res3)
                label6.Text = "验证码输入正确";
            else
                label6.Text = "验证码输入不正确";
        }
    }
}