C#编程基础 实验（8） (4)

using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;

using System.Windows.Forms;

namespace WindowsFormsApplication1
{
public partial class Form1 : Form
{
public Form1()
{
InitializeComponent();

}

private void Form1_Load(object sender, EventArgs e)
{
this.Text = "我的文本框实验";
button1.Text = "结束";
}

private void label1_Click(object sender, EventArgs e)
{
label1.Text = "下面文本框只能输入0至9十种数字，且长度最多8个";
}

private void button1_Click(object sender, EventArgs e)
{
this.Close();
}

private void textBox1_KeyPress(object sender, KeyPressEventArgs e)
{
if (e.KeyChar < '0' || e.KeyChar > '9')
{
e.Handled = true;
}
textBox1.MaxLength = 8;
}

private void textBox1_TextChanged(object sender, EventArgs e)
{

}
}
}