黑马程序员之WinForm编程基础学习笔记：页面上有一张图片，默认是隐藏的，用户在文本框中输入身份证号(131226198105223452),点击按钮，如果年龄大于18岁则显示图片。

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using System.Collections.Generic;

using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Linq;
using System.Text;
using System.Windows.Forms;

namespace Test4
{
      public partial calss Form1 : Form
      {
            public Form1()
            {
                   InitialzeComponent();
            }
            private void button1_Click(object sender, EventArgs e)
            {
                       string 身份证号 = textBox1.Text;
                       //检验是否是合法的身份证号，不考虑X
                       //131226198105223452
                       pictureBox1.Visible = false;
                       string strYear = 身份证号.Substring(6,4);
                       int year = Convert.ToInt32(strYear);
                       if(DateTime.Now.Year - year > 18)
                       {
                              pictureBox1.Visible = true;
                       }

            }
      }

}

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